Valve timing. Atmospheric air

Transcription

1 31.5-mm wide vacuum unit is designed to optimize the control of large vacuum flows. Vacuum generator and External vacuum controller are available for various needs. Three different types of vacuum generator are available: single-nozzle type (nozzle diameter: 1.5mm, 2.0mm), two-stage nozzle type (nozzle diameter: 0.7mm, 1.0mm, 1.2mm) and twin-nozzle type. The twin-nozzle type, the most durable unit for applications with longer suctioning or transporting time, is controlled by means of both large and small diameter nozzle. The large nozzle controls vacuum generation from start up to a prescribed reference preset pressure level, after which the small nozzle takes over for maintaining a vacuum level. This combination makes possible substantial reductions in Air consumption (patent pending). Large/small nozzle change-over pressure adjusting trimmer Pilot valve for large-caliber nozzle Valve timing Pilot valve for blow-off Vacuum reference pressure (can be set by user) Air consumption Pilot valve for small-caliber nozzle Atmospheric air Large-caliber nozzle Small-caliber nozzle Blow-off adjusting needle SW1 SW2 kpa Nozzle type T15 T20 Air consumption (l/min(anr)) The two-stage nozzle type's vacuum suction rate has been increased by approximately 40% compared to conventional types (PISCO Vacuum Generator complex type with single nozzle) Suction flow: The single-nozzle type is an orthodox, complex vacuum generator designed to produce large vacuum flows. A wide variety of valve type is standardized: Single-nozzle type: Normally open, Normally closed, Double solenoid (retention) type Two-stage nozzle type: Normally open, Normally closed type Twin-nozzle type: Normally closed type External vacuum controller: Normally open, Normally closed type With our pressure sensors, a high level of visual recognition (in-house comparison) has been realized - the result of a 31-mm-wide large-sized LED display. All settings can be made using just three push buttons. Four different display units are available. SW1 SW2 kpa 177

2 Unit Vacuum generator External vacuum controller Fluid medium Operating pressure range Operating temp. range Working vacuum range Air 44 ~ 102psi (0.3 ~ 0.7MPa) 41 ~ 122 F (5 ~ 50 C) 0 ~ -29.8in. Hg (-100 ~ 0kPa) Nozzle type Single nozzle Twin nozzle 2-stage nozzle H15 L15 E15 H20 L20 E20 T / / /0.6 Nozzle dia. (in./mm) (Small-caliber) (Large-caliber) T / /2.0 (Small-caliber) (Large-caliber) D /0.7 D /1.0 D / /1.5 Pressure supply Final vacuum Suction flow Air consumption (psi/mpa) (in. Hg/kPa) (SCFM/l/min(ANR)) (SCFM/l/min(ANR)) 50.8/ / / / / / / / /-93 (-27.5/-93) -27.5/ / / / / / / /40 (0.84/24) 2.47/70 (1.26/36) 1.82/ / / / / / / /100 (0.81/23) 7.06/200 (1.61/46) 0.81/ / /70 * Numerical values in parentheses ( ) for twin-nozzle type vacuum generators are for small-caliber nozzle. * The flow rate in SCFM is a reference value converted by multiplying l/min(anr) by Operating pressure range ~ 29.5in. Hg (-100 ~ 100kPa) Proof pressure 59.1in. Hg (200kPa) Storage temp. range -4 ~ 158 F (-20 ~ 70 C) Operating temp. range 14 ~ 122 F (-10 ~ 50 C) Operating humidity range 35 ~ 85%RH Power requirements 12 ~ 24VDC ±10%, ripple P-P: 10% or less Protective structure IEC specification IP40-equivalent No. of pressure-setting points 2 NPN open collector: 30VDC, 100mA or less; residual voltage: 1.2V or less Switch output (when applied with a 100mA-load current) Differential response 0 ~ 30 digit (Variable) Accuracy of response Within the range of ±3%F.S. Responese 5m sec max. Indication 2-1/2 digit-7-segmented LED display No. of indications About 4 times/sec Indication accuracy ±1%F.S. ±1 digit Temperature characteristics ±0.3%F.S. (reference temperatures: 32 ~ 122 F (0 ~ 50 C), 77 F (25 C)) Voltage rating 24VDC Direct operation 100VAC Allowable voltage range Surge limiting circuit Power consumption 24VDC ±10% Surge absorber 0.55W 100VAC ±10% Bridge diode 1VA Manual operation Operational indication Lock type push-button Red LED lights up during coil excitation Item Valve type Lubrication Valves for small-caliber nozzle Valves for Large-caliber nozzle Blow-off solenoid valve Pneumatic operation by pilot valve N.C. (Normally closed) Not required Effective sectional area (Cv factor) 3.5mm 2 (Cv: 0.19) 16.5mm 2 (Cv: 0.89) 3.5mm 2 (Cv: 0.19) Item Suction solenoid valve Blow-off solenoid valve Pneumatic operation by pilot valve Valve type N.C. (Normally closed), N.O. (Normally open) N.C. (Normally closed) Lubrication Not required Effective sectional area (Cv factor) 3.5mm 2 (Cv: 0.19) Item Suction solenoid valve Blow-off solenoid valve Valve type Pneumatic operation by pilot valve N.C. (Normally closed), N.O. (Normally open) N.C. (Normally closed) Lubrication Not required Effective sectional area (Cv factor) 16.5mm 2 (Cv: 0.89) 3.5mm 2 (Cv: 0.19) Min. excitation time 50m sec or more Item Suction solenoid valve Blow-off solenoid valve Pneumatic operation by pilot valve Valve type N.C. (Normally closed), N.O. (Normally open) N.C. (Normally closed) Lubrication Not required Effective sectional area (Cv factor) 16.5mm 2 (Cv: 0.89) 3.5mm 2 (Cv: 0.19) * Cv factor is a reference value converted by multiplying effective cross-sectional area (mm²) by Element material Filtering capacity Element surface area Replacement element Parts No. Supply pressure Blow-off air flow PVF (Polyvinyl formal) 10µm 1,507mm 2 VQ030B psi (0.5MPa) 0 ~ 1.77SCFM (0 ~ 50l/min(ANR)) 178

3 (1) (2) (3) (4) (5) (6) (7) (1) Vacuum characteristics, Nozzle diameter Nozzle dia. Pressure Final Suction flow Air Code supply vacuum consumption (in./mm) (psi/mpa) (in. Hg/kPa) (SCFM/l/min(ANR)) (SCFM/l/min(ANR)) -27.5/ /63 Single 3.53/ / / /95 nozzle 50.8/ / / /70 type -27.5/ / / / / / / / / /150 Twin- 0.02/ / / /100 (Small-caliber) (Large-caliber) -27.5/-93 (0.84/24) (0.81/23) nozzle type 0.03/ /2.0 (-27.5/-93) 2.47/ /200 (Small-caliber) (Large-caliber) (1.26/36) (1.61/46) 2-stage 0.03/ / /23 nozzle 0.04/ / / /46 type 0.05/ / /70 * The vacuum characteristics in ( ) value for Twin-nozzle type is the value when small-caliber is operated. * The flow rate in SCFM is a reference value converted by multiplying l/min(anr) by (2) Vacuum generator valve type : Normally closed type : Normally open type : Double solenoid type (retention type) *1. "Normally-close (code: C)" only when a twin-nozzle type is selected in (1). *2. "Normally-close (code: C)" or "normally-open (code: O)" only when a 2-stage nozzle type is selected in (1). (3) Vacuum (V) port size mm size (mm) Code Dia. ø8 tube fitting ø10 tube fitting (4) Air supply (PS) port size mm size (mm) Code Dia. ø6 tube fitting ø8 tube fitting ø10 tube fitting * ø6 tube fitting is only selectable when 2-stage nozzle type is selected. (5) Exhaust (EX) port size Silencer vent Tube exhaust type Code Dia. (mm) ø12 tube fitting (6) Pilot valve voltage Code Voltage 24VDC 100VAC * As for twin-nozzle type, only 24VDC type is available. (7) Vacuum switches (NPN Open collector) Code Specifications for vacuum switch 31mm-width 2-point output vacuum switch Without vacuum switch * Pilot valve's exhaust port is fitted with a ø6mm quick-fitting joint. (1) (2) (3) (4) (5) (1) Vacuum supply valve type : Normally closed type : Normally open type (2) Vacuum (V) port size mm size (mm) Code Dia. ø10 tube fitting ø12 tube fitting ø16 tube fitting (3) Vacuum supply (PV) port size mm size (mm) Code Dia. ø10 tube fitting ø12 tube fitting ø16 tube fitting * Pilot valve's exhaust port and air supply port are each fitted with a ø6mm quick-fitting joint. (4) Pilot valve voltage Code Voltage 24VDC 100VAC (5) Vacuum switches (NPN Open collector) Code Specifications for vacuum switch 31mm-width 2-point output vacuum switch Without vacuum switch 179

4 Before using the PISCO device, be sure to read the "Safety Instructions", "Common Safety Instructions for Products Listed in This Manual" on page 13 to 15 and "Common Safety Instructions for Vacuum" on page 136. Warnings: 1. With VQ series vacuum units, the range of working temperature is limited to 41~122 F (5~50 C). Do not use VQ series vacuum unit in any other temperature range. 2. Coil of pilot solenoid valve generates heat with the following to conditions. It may lead to shorten the product life or operational malfunction by heat. Additionally, it may cause burns on worker or influence a peripheral device adversely. In such cases, please consult with Pisco. long continuous energization about 2 or more hours high cycle operation When, even as for the intermittent energization, the total energization time is longer than the total of non-energization time within a day. 3. With double-solenoid types, the switch-over valve (main valve) is placed in neutral after the supply of pilot air has been suspended (the same is true when the valve is being operated for the first time after shipment). When resuming the supply of pilot air, be sure to send a signal to the pilot valve, or conduct switch-over operations manually as required. 4. When operating valves, confirm that leak currents are 1mA or less. Using valves with leak currents exceeding said value may lead to errors. 5. The vacuum retention capability of vacuum pump system-compatible units has been designed to tolerate some leaking. We therefore recommend that additional appropriate safety measures be taken when the state of vacuum is to be retained for a prolonged period of time. 6. Do not use these units in environments containing corrosive substances (airborne or otherwise). 7. Our products are not explosion proof. Do not use these units in environments containing flammable and/or explosive gases and/or liquids, since doing so could cause fires and/or explosions. 8. Do not use these units in temperature ranges which exceed the prescribed range of working temperatures. Operating them in heat-generating temperature ranges can cause the built-in sensors to malfunction. 9. When wiring, be sure to 1) switch OFF the power, and 2) confirm the color of each lead wire, terminal numbers, etc. in order to prevent the output terminal from being inadvertently short-circuited with the power source and the common-use terminals. Short-circuiting these terminals can be cause sensor-related problems. Cautions : 1. Compressed air contains various drains (water, oxidized oils, tar and other foreign matter). Because these drains considerably lower product quality, we recommend that the quality of compressed air be improved by dehumidifying it via a cooler or dryer. 2. Do not use lubricators. 3. Rust, dirt and other foreign matter left in the pipes can cause malfunctions. We therefore recommend that a filter of 5µm or less be placed in front of and close to the supply port. Flushing the interior of the piping prior to operation and/or at regular intervals is also recommended. 4. Do not pull or bend valve and vacuum switch lead wires excessively. Doing so may result in lead wires being snapped off and connector components broken. 5. Do not use any vacuum units in corrosive and/or flammable gaseous environments. Do not use this equipment for the hardling of fluids. 6. Our vacuum units are not constructed to be drip- or dust-proof. As such, do not use any vacuum units which have been exposed to water, oil and/or dust. 7. Do not allow vacuum generators to take in dust, salt and/or iron powders. 8. Do not operate vacuum release valves while a vacuum is being generated. 9. When replacing supply ports and vacuum ports cartridges, be sure to remove any foreign matter sticking to cartridge seals; make sure cartridge fixing pins are properly inserted into the appropriate ports. 10. Use the shortest pipes possible when piping vacuum components (concentrated exhaust, pilot air exhaust and supply units). Using long pipes can prevent vacuum units from performing properly. 11. For power, use stable direct currents. 12. Insert surge-absorbing circuits into relays, valves, etc. that are connected to the output terminals, power source terminals, etc. Do not arbitrarily use vacuum units at currents that exceed rated levels. 13. When using unit power sources, such as switching power sources, be sure to ground their FG terminals. 14. Take the utmost care to avoid short-circuiting the output terminal with other terminals. 15. Do not apply excessive loads to vacuum generators. Subjecting them to excessive loads can damage the equipment. 16. Do not wire nozzles and other components in a way that will subject them to impressed pressure. Do not use them in an arbitrary manner, either. Applying impressed pressure to vacuum components and/or using them arbitrarily can cause malfunctions. 17. In case of using twin-nozzle type, please set pressure allowance between the vacuum level at work suction time and the setting value of Large/Small nozzle change-over pressure sensor. If these values are similar, the Large/Small caliber pilot valve might actuate simultaneously. 180

5 The products listed in this page are ECO-friendly products. * Please refer to page 4 for the details of ECO-friendly products. VQ - S- VQ - J- VQ - S- -S VQ - J- -S VQD - S- VQD - J- VQD - S- -S VQD - J- -S VQT C- S- VQT C- J- VQT C- S- -S VQT C- J- -S Cautions *1. For, please select a vacuum characteristic and nozzle diameter. *2. For, please select an ejector valve type. *3. For, please select a vacuum port size. *4. For, please select an air supply port size. *5. For, please select a pilot valve voltage. *6. Build-to-order production Package specifi cation 1 pc. in a bag Fixing screw VQP - - Filter cover Filter element Designation VQ030B61 Element cover Silencer element 2 : SED2212 Silencer element 1 : SEE1202 Fixing screw VQP - - -S * The element set includes SED2212 and SEE1202. Designation SED2212-SET Cautions *1. For, please select a vacuum supply valve type. *2. For, please select a vacuum port size. *3. For, please select a vacuum supply port size. *4. For, please select a pilot valve voltage. *5. Build-to-order production Package specifi cation 1 pc. in a bag Package specifi cation 1 pc. in a bag 181

6 Be sure to read the following instructions before selecting and using the PISCO devices. Also read the detailed instructions for individual series. Warnings: 1. Where there is a danger of work dropping, provide some drop prevention means to assure safety. 2. Avoid use where there are constant pressures of 0.1MPa (14.5psi) or above in the vacuum circuit. Since the vacuum devices are not of explosion-proof structure, such use may cause damage to the device bodies. 3. Watch out for the drop of vacuum due to faulty air supply or power supply. Reduced suction may cause the drop of work. Therefore, take an adequate protective measure. 4. Where two or more pads are used with a single ejector in vacuum circuit, defective suction of one pad may cause the drop of vacuum at the other pad(s). 5. Avoid such usage as may stop up the exhaust port of the ejector or raise exhaust resistance. Such careless usage may cause the loss or drop of vacuum. 6. Do not use the vacuum devices in an atmosphere containing corrosive gas, inflammable gas, explosive gas, chemicals, seawater or vapor. Never allow the vacuum system to suck in such substances. 7. Provide a protective cover where the equipment is exposed to sunshine. 8. Carry out periodic maintenance and checks of the silencer element of the ejector and the filter element of the vacuum filter. A clogged element may cause performance drop or trouble. 9. Replace the element after gaining a full knowledge of the element of the vacuum generator. 10. Install the piping by checking the ports of the ejector in the manual and by the marking on the body. Mistaken piping may cause damage to the device body. 11. Use clean supplying air free from drainage or dirt for ejector. Also, never supply lubricated air. Impurities or oil contained in compressed air may cause malfunction or performance drop. 12. Do not give excessive tension or bending to lead wire. Disconnection may result. 13. Tighten the lock nut, in any, on the product securely with your hand and not with any tool. Tightening with a tool may cause damage to the lock nut or the device body. Also, incomplete tightening may cause a loose lock nut or inaccurate initial setting. 14. Do not subject the product with a rotatable resin body to forcible swinging or rotation. Damage to the resin body or leakage may result. 15. Do not flow excessive air or dried air. Rubber degradation or oil may cause malfunctions. 16. Do not use the equipment in locations where they can be exposed to water drops, oil drops, dust, etc. They may cause malfunctions. In case they are used under the conditions, prepare protect measures. 17. Do not use the equipment in locations with inflammable or explosive gas, fluid or atmosphere. Fire or explosion may occur. 18. Do not use the equipment in atmosphere of corrosive gas, chemicals, seawater, water and steam. These applications may cause trouble to equipment. 19. Do not wash or paint products with water or solvent. 20. Avoid the use of equipment where they are exposed to excessive vibration or shocks. Such use may cause malfunction or trouble. Cautions : 1. The specified supply pressure to the ejector is that during ejector operation. Secure the specified level in consideration of pressure drop. If the specified level is not met, then the ejector may emit an abnormal noise at certain supply pressures and become unstable, affecting the sensor and other parts adversely. 2. In selecting the piping and equipment, take into account that the effective sectional area on the supply pressure side of the ejector should be about three times the sectional area of the nozzle diameter. Inadequate supply flow may result in performance drop. 3. Provide the vacuum-side piping as short as possible and with the bore as large as possible. If the piping is long or the bore is small, the responce time at suction or release may become longer and the necessary suction flow may not be achieved. 4. Connect the vacuum switch or the ejector with vacuum switch as close to the end of the vacuum piping as possible. With long distance between the vacuum switch and the end of vacuum piping, the flow resistance may become large and the vacuum at the sensor may be high even during the non-suction interval. This will cause malfunction of the vacuum switch. 5. In handling the joints, observe the instructions in "Common Safety Instructions for Quick-Fitting Joints" (For installation and removal of the screwed-on type, refer to "4. Notes on Installation" and "5. Notes on Removal".) 6. In handling the electronic vacuum switch (sensor), observe the "Common Safety Instructions" and "Detailed Safety Instructions" for the pressure sensors and the pressures sensors with digital indication of the control sereis. 7. In handling the mechanical vacuum switch (sensor), observe the "Common Safety Instructions for mechanical vacuum switches". 8. The filter clear cover is polycarbonate, so avoid use in an atmosphere or location containing chemicals (see table below). Names of Chemicals Thinner Carbon tetrachloride Choloroform Acetate Aniline Cyclohexane Trichloroethylene Suphuric acid Lactic acid Water soluble cutting oil (alkaline) * There are chemicals other than listed above that can not be used. Please contact PISCO for information. 136

7 This Safety Instructions aim to prevent injuries to human bodies and damage to properties by requiring proper use of PISCO devices. Also the relevant requirements of ISO 4414 and JIS B8370 must be observed. ISO 4414: Pneumatic fluid power Recomendations for the application of equipment to transmission and control systems. JIS B 8370: General standards for pneumatic systems Safety instructions are classified into "Danger", "Warning" and "Caution", depending on the degree of danger or damage involved when the safety instructions are not complied with in handling the equipment. Danger : Failure to heed the warning of apparent danger may result in death or serious injuries. Warning : Failure to heed the warning of conditionally dangerous situations may result in death or serious injuries. Caution : Failure to heed the warning of conditionally dangerous situations may result in minor or not too serious injuries or damage to properties. Warning : 1. Make a selection of pneumatic equipment. (1) Well knowledgeable and experienced persons such as a pneumatic system designer or who is in charge of deciding specification should select pneumatic equipment. (2) The applicable conditions of the products in this catalogue are diverse. Therefore, judge the conformity of systems with required analysis or tests by system designers or persons who is in charge of deciding specifications. The guarantee of initial performance and safety of the system is on responsibility of the person who decides specifications. Hereafter, examine all the specification with updated products catalogues and technical documents in order to avoid malfunctions of equipment, and then develop systems. 2. Handle pneumatic equipment with enough knowledge and experience. (1) Mishandling of compressed air is dangerous. Conduct assembly, operation and maintenance of devises with pneumatic equipment by persons with enough knowledge and experience. 3. Do not operate and remove the equipment until safety is confirmed. (1) Conduct inspection and maintenance of equipment after confirming fail-proof measures of work pieces or runaway-proof device are properly working. (2) When removing equipment, make sure that above safety measures are conducted. Then, stop air supply and electric source of equipment making sure the pressure inside the system is zero before removing equipment. (3) When re-activate equipment, make sure safety measures against fly-out are taken and re-activate equipment with care. * Safety Instructions are subject to change without advance notice. 13

8 PISCO products are designed and manufactured for use with general industrial machinery and equipment. Therefore be sure to observe the following safety instructions: Danger Warning : 1. Avoid the following uses for PISCO devices: (1) Use under conditions not specified for the device (2) Use in any outdoor environment (3) Use in locations where the device is exposed to excessive vibration or shocks (4) Use in locations where the device is exposed to any corrosive gas, inflammable gas, chemicals, seawater, or vapor. * Certain PISCO devices, however, can be used in environments as described above. Therefore check on the specifications for the use of individual devices. 2. Do not disassemble or remodel the PISCO devices in such a way as may affect the basic structure, performance or function of them. 3. Never touch the release ring of the Quick-Fitting Joint when there is pressure working on it. Touching may release the ring, which in turn may cause the tube to fall out. 4. Avoid too frequent switching of air pressure. Otherwise the device body may heat up to cause burns on you. 5. Do not allow tension, twist or bending forces to act on the joints. Undue forces may damage the joint body. 6. For applications in which the threaded side or the tube connection side is subject to vibration, use Rotary Joints, High Rotary Joints or Multi-Circuit Rotary Blocks only. Swinging or rotation may damage the joint body. 7. For applications with hot water of 60 C (140 F) or above or thermal oil, use no other joints than Die Temperature Control Fitting, Tube Fitting Stainless SUS316, Tube Fitting Stainless SUS316 Compression Fitting, and All Brass Compression Fitting. Heat or hydolysis may damage the joint body. 8. For applications in which the scattering of static electricity or charging must be prevented, use no other joints than EG Joints. Static electricity may cause system malfunction or trouble. 9. Never use joint other than Tube Fitting Spatter or Tube Fitting Brass where they are exposed to spatter. Otherwise can cause fire. 10. Carry out maintenance and checks of equipment only after turning power off, shutting fluid off and making certain that the pressure in the piping has dropped to zero. Please conduct maintenance after confirming following points. (1) Make sure that maintenance is safe for all the systems involving PISCO products. (2) When re-activate equipment after maintenance, make sure safety measures against fly-out are taken and re-activate equipment with care. (3) Please secure space for maintenance when the circuit is designed. 11. When the fluid is admitted to the equipment and if there is a possibility to cause damage to it due to leakage, conduct safety measures such as protect cover beforehand. Caution : 1. Do not use PISCO devices with the following equipment: (1) Equipment used for the sustenance or control of people's health or lives (2) Equipment used for the movement or transport of people (3) Equipment used specifically to ensure safety : 1. In installing the piping, be sure to remove dust or drainage from within the piping. Dust or drainage left unremoved may enter other equipment, thus causing troubles. 2. When using an ultrasoft tube to connect to a Quick-Fitting Joint, be sure to use an insert ring in the bore of the tube. Otherwise the tube may fall out to cause leakage. 3. When you use tubes of brands other than ours, be sure to confirm that the outside diameter of the tubes satisfies the tolerance specified Table 1. Table 1. Tube O.D. Tolerance mm size Nylon tube Urethane tube ø1.8mm ±0.05mm ø3mm ±0.15mm ø4mm ±0.1mm ±0.15mm ø6mm ±0.1mm ±0.15mm ø8mm ±0.1mm ±0.15mm ø10mm ±0.1mm ±0.15mm ø12mm ±0.1mm ±0.15mm ø16mm ±0.1mm ±0.15mm inch size Nylon tube Urethane tube ø 1 /8 ±0.0039in. ±0.0059in. ø 5 / in. ±0.0059in. ø 3 /16 ±0.0039in. ±0.0059in. ø 1 /4 ±0.0039in. ±0.0059in. ø 5 / in. ±0.0059in. ø 3 /8 ±0.0039in. ±0.0059in. ø 1 /2 ±0.0039in. ±0.0059in. ø 5 /8 ±0.0039in. ±0.0059in. 14

9 4. Cautions on the fitting of tube (1) Make certain that the end of the tube is cut at right angles, the tube surface is free from flaws, and the tube is not deformed into an ellipse. (2) When fitting a tube, insert the tube to the tube end completely as drawings shown below to prevent leakage. Tube end : GOOD Release-ring : NG Tube Lock claws Sealing: Elastic-sleeve Tube is not inserted fully to tube end. (3) On completion of fitting, make certain that the tube does not come out at your pulling. 5. Cautions on the release of tube (1) Before releasing the tube, make certain that the pressure inside the tube is zero. (2) Push the release ring fully inside and pull out the tube. Unless you push it completely in, the tube may not come out and scrapings of tube may be left inside the joint. 6. Cautions on the installation of joint body (1) When installing the joint body, tighten it with a proper tool, using the outside or inside hexagon. (2) In tightening the screw, use the tightening torque recommended in Table 3. Use of a torque higher than the recommended level may damage thread or deform gasket, thus causing leaks. Use of a torque lower than the recommended level may cause loose screw and leakage. (3) With the joint whose piping direction will not change after tightening, make adjustment within the recommended range of tightening torques. Table 3. Tightening Torque, Sealock Color and Gasket Material Thread type Thread size Tightening torque Sealock color Gasket material M N m (0.52lbf ft) M ~ 1.5N m (0.74 ~ 1.11lbf ft) n/a SUS304, NBR M ~ 2.7N m (1.48 ~ 1.99lbf ft) Metric thread M ~ 0.6N m (0.37 ~ 0.44lbf ft) M ~ 1.5N m (0.74 ~ 1.11lbf ft) M ~ 1.0N m (0.59 ~ 0.74lbf ft) n/a POM (Polyacetal) M ~ 2.0N m (0.74 ~ 1.48lbf ft) R1/8 7 ~ 9N m (5.16 ~ 6.64lbf ft) Taper pipe thread R1/4 12 ~ 14N m (8.85 ~ 10.33lbf ft) R3/8 22 ~ 24N m (16.23 ~ 17.70lbf ft) White n/a R1/2 28 ~ 30N m (20.65 ~ 22.13lbf ft) Unified thread No UNF 1.0 ~ 1.5N m (0.74 ~ 1.11lbf ft) n/a SUS304, NBR 1/16-28NPT 7 ~ 9N m (5.16 ~ 6.64lbf ft) 1/8-27NPT 7 ~ 9N m (5.16 ~ 6.64lbf ft) National Pipe Thread Taper 1/4-18NPT 12 ~ 14N m (8.85 ~ 10.33lbf ft) (American standard) 3/8-18NPT 22 ~ 24N m (16.23 ~ 17.70lbf ft) Gray n/a 1/2-14NPT 28 ~ 30N m (20.65 ~ 22.13lbf ft) Recommended tightening torque for silencer Thread Type Thread Size Tightening Torque M5 0.8 Metric thread M6 1.0 M /6 turn after hand-tightening G1/8 Parallele pipe thread G1/4 G3/8 1/2 ~ 1 turn after hand-tightening G1/2 7. Cautions on the removal of joint body (1) When removing the joint body, loosen it with a proper tool, using the outside or inside hexagon. (2) Remove sealant sticking to the thread on the mating equipment. The sealant left sticking may enter the perpheral equipment and cause trouble. 8. Clean-room package option * The product is washed by clean air after assemblying in the normal assembly process as same condition as standard specification model. Then, it is packed in ISO class 6 clean-room. 15