Branch-specific applications (electric vacuum and blow-off control) Description The communication between both elements, electronic vacuum switch and gripping valve control allows the consumption of compressed air to be regulated and in particular significantly reduced. This range of is strongly recommended for gripping air-tight objects, holding and for medium or long cycles. Electrically controllable blow-off is integrated for release. Safety The GVMAX E1 has a check valve installed as standard which enables it to maintain the vacuum within the circuit if there is a power failure. This function guarantees maximum safety conditions for operators during handling. Materials Similar to GEM (see page /18). Characteristics Ø max. vacuum air drawn in L2 model nozzle (%) (Nl/min) (mm) (g) (mm) X T N X T N S K (1) GVMAX E1 2.5 50 75 0 360 240 200 60 121 510 (1) delivered as standard on version X. Evacuation time in seconds per liter % vacuum Ø nozzle 10 20 30 35 40 45 50 60 70 80 85 versions (mm) X T N X T N X T N X X T N X T N T N T N N N GVMAX E1 2.5 0.02 0.03 0.03 0.04 0.06 0.07 0.08 0.10 0.11 0.01 0.14 0.14 0.16 0.1 0.21 0.22 0.30 0.30 0.50 0.41 0.60 0.77 Operating principle When the selected vacuum level is reached, the compressed air supply stops. This interruption does not have any effect as the check valve maintains the vacuum and thus the grip. The vacuum switch continually analyzes the vacuum requirements. As soon as the minimum threshold is reached, it actuates the vacuum generation valve to return to the pre-set value. See pages /21 and /23. Specifications Supply Non-lubricated filtered air, 2 to 6 bar, optimum at 4 bar Temperature 0 to 60 C / 32 to 140 F Contact output PNP all-or-nothing NO or NC, adjustable hysteresis Anti-parasite function Integrated with display LED Suction rate Adjusted by flow restrictor Curves: see page /27 (1) LED gripping display (2) Compressed air inlet (3) LED blow-off display (4) Vacuum 1/2 Gas (5) PSA100C vacuum switch (6) 1/4G (7) White: Contact output (8) Brown: 24V DC (gripping) () Blue: common (10) Black: 24V DC (blow-off) (1) (2) (3) 50.20 35 70.20 Dimensions 5 35 (4) 228.20 (5) Ø 4.2 L2 (7) (6) (10) (8) () 2.15 56.70 30 47.75 44.20 For all orders, please specify: Model + Characteristic + Silencer + C.A. fitting + E1 1: Model GVMAX 2: Characteristic X 50% vacuum T 75% vacuum N 0% vacuum 3: Silencer - Without silencer S Diffuser K Through-type 4: C.A. fitting 14 1/4 G BSPP E.g. GVMAX NK 14 E1 (GVMAX vacuum pump with electric self-regulation, 0% vacuum with through type silencer and C.A. 1/4G fitting) E1 - /28 -
General points Description COVAL's innovative of pumps are designed for gripping, handling and retaining air-tight objects. The principle is simple: as soon as the required level of vacuum is reached, the compressed air supply is stopped and the vacuum is maintained in the installation thanks to the check valve. Thus, the self-regulating system guarantees an optimum level of vacuum. This approach considerably reduces both compressed air consumption and the noise level. Moreover, thanks to their intelligent functions, they guarantee safety and optimum vacuum management for the application. COVAL recommends these pumps for applications involving air-tight objects. The specifi c functions of vacuum-regulating They have the following characteristics: Vacuum generation by venturi effect (maximum pressure drop - 00mbar or 0% vacuum). Air-saving, vacuum-regulating function. Adjustable blow-off. Visual and switching output control of vacuum level by digital electronic vacuum switch. Positive safety holds objects in case of electrical emergency stop (electrical outlets switched off) via its NO vacuum supply valve, maintenance can be carried out in complete safety. Operating principle of a vacuum pump % vacuum REGULATION SUCTION BLOW-OFF WAITING cycle ROBOT RETURN WAITING new cycle t The cycle shows the three stages of a GVMAX: Waiting - Suction - Blow-off. Regulation is automatically performed by the equipment's internal loop. The interest of the GVMAX vacuum pump is based on these three stages: Waiting: no consumption, no clogging, no noise. Suction-regulation: the object is gripped and the vacuum pump automatically stops. Blow-off: automatically timed for release and return to neutral position in readiness for the next cycle. Note: in addition to silent operation and energy savings, status 1 allows to perform the operation without an upstream solenoid valve cutting off the air inlet in "waiting" mode. - /21 -
General points Regulating system in an air-saving vacuum pump The GVMAX vacuum pump is designed to save compressed air during a gripping cycle. The equipment stops consuming compressed air when the vacuum threshold pre-set in the vacuum switch is reached in the network. This is known as "regulation". The curve below shows the regulating system of a vacuum pump. As soon as optimum vacuum (vacuum threshold 1) is reached, the pumps maintain the vacuum until the level of vacuum descends to the hysteresis value after a period of time "t" due to leakage. The self-regulating system guarantees that an optimum level of vacuum is maintained and reduces both air consumption and the noise level throughout the cycle. Vacuum within the enclosure Vacuum level in relation to time for a regulation cycle Vacuum threshold Vacuum within the enclosure Consumption of compressed air Delta t depends on leakage and the volume regulated Time GVMAX vacuum pump yield Volume of air consumed and time to create a vacuum in a 5 liter tank with a 4 bar GVMAX vacuum pump: vacuum (%) time to create a vacuum (s) air consumed (Nl) 10 0.2 0. 20 0.3 1.8 30 0.6 2. 40 0.8 4.2 50 1.1 5. 60 1.5 7.8 70 2.1 10. 80 3.0 15.7 85 4.0 21.0 - /22 -
Applications Holding During the fi nal phase of manufacture a snowboard must be held in position for many minutes. Using with air-saving function generates signifi cant energy savings. Also see the LEMAX series, pages /8 - /13. Emptying a tank The regulation function of the are used in this type of application. Hysteresis of the switching output regulation is adjustable between 1 and 25% vacuum on electric models. 1/4 turn valve for returning to atmospheric pressure Note: For regulation of the vacuum level in tanks of more than 10 liters, consult us for the pneumatic versions. Grip is maintained safely Electric GVMAX Grip is maintained on the object (air-tight object) if there is a power failure. Pneumatic GVMAX Grip is maintained on the object (air-tight object) if the pneumatic power is interrupted. Air-tight objects Grip is maintained if the electrical power or compressed air supply is interrupted. - /23 -
The range of modular and intelligent Advantages nreduced energy consumption nreduced noise levels nincreased life expectancy ncan be adapted to all branches ntechnical development of the Coval valve resulting from technological advances in aerospace and automotive applications. New optimized fluidics The COVAL range of modular operates with a pressure supply of 4 bar. Developed by COVAL over the years, this range is the result of research and optimized technical solutions. Thanks to the new fluidics, this range of vacuum pumps offer an optimized performance. GVP GVPS LEM GEMP GVPD LEMAX 8 Model MODULAR VACUUM PUMPS INTELLIGENT VACUUM PUMPS GVP GEMP GVPS GVPD LEM LEMAX GEM GVMAX--V3 GVMAX--V2 GVMAX Compressed air control (Suction) Blow-off control Integrated pressure regulator Powerful blow-off Electronic vacuum switch with display Electronic vacuum switch Vacuum switch with electrical contact Vacuum check-valve Electric control Pneumatic control Twin Tech (Integration & Intelligence) ASC (Air saving Control) Automatic vacuum regulation M8 connections M12 connections : Standard or integrated : Option GEM GVMAX--V3 GVMAX--V2 GVMAX