Edwards and the Edwards logo are trademarks of Edwards Limited.
B650-01-880 Issue G
CAUTION
WARNING
1Introduction
1.1Scope and definitions
This manual provides installation, operation and maintenance instructions for the Edwards GV Gate Valves (referred
to as GV Valves throughout the remainder of this manual). You must use the GV Valves as specified in this manual.
Read this manual before you install and operate the GV Valve. Important safety information is highlighted as
WARNING and CAUTION instructions; you must obey these instructions. The use of WARNINGS and CAUTIONS is defined
below.
Warnings are given where failure to observe the instruction could result in injury or death to
people.
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment and process.
Introduction
The units used throughout this manual conform to the SI international system of units of measurement.
1.2Description
The GV Valves are bellows sealed gate valves for use in applications which require high leak tightness and a minimum
of hydrocarbons in the vacuum system.
The GV Valves have stainless steel bodies of vacuum brazed construction. The valve bodies have been electropolished
both inside and out and have been baked to 1100 °C during manufacture; this eliminates the possibility of virtual
leaks in the GV Valve and ensures that the GV Valve has low outgassing characteristics.
GV Valves are available with ISO flanges, ANSI flanges and CF (ConFlat®) metal sealed flanges; use CF flanged
GV Valves for applications which require ultra high vacuum and very high baking temperatures. ISO and ANSI valves
are supplied with fluoroelastomer bonnet seals; CF GV Valves have metal bonnet seals. All GV Valves have
fluoroelastomer valve plate seals.
Manual and pneumatically actuated GV Valves are available. The pneumatically actuated GV Valves have position
indicators which can be used by your control equipment to determine when the valve is open or closed:
! GVI*P pneumatically actuated ISO valves have reed switch position indicators (see Section 3.5.2).
! Other pneumatically actuated ISO GV Valves and all pneumatically actuated CF GV Valves have microswitch
Edwards and the Edwards logo are trademarks of Edwards Limited.
B650-01-880 Issue G
WARNING
WARNING
3Installation
Where necessary, use suitable lifting equipment to move the valve. Refer to Table 1 for the mass
of the valves.
3.1Unpack and inspect
Remove all the packing materials and check the GV Valve; do not remove the protective covers from the valve flanges
yet.
If the GV Valve is damaged, notify your supplier and the carrier in writing within three days; state the Item Number
of the GV Valve together with your order number and your supplier’s invoice number. Retain the packing materials
for inspection. Do not use the GV Valve if it is damaged.
If the GV Valve is not to be used immediately, store the GV Valve in suitable conditions as described in Section 6.
3.2Installation requirements
Installation
Take appropriate precautions when you install the GV Valve in a system in which dangerous
process substances have been pumped.
The GV Valve can be fitted in any orientation. However, we recommend that you install the GV Valve with the
carriage side of the valve plate on the high vacuum side of the vacuum system. This ensures that the valve body is
under vacuum at all times and prevents the need to pump down the valve body.
The GV Valve is supported by the pipeline it is fitted to. You must:
! Ensure that the GV Valve and the adjacent pipelines are adequately supported.
! Ensure that the pipeline flanges are in-line, parallel and the correct distance apart, to prevent stress on the
valve body.
! Ensure that the installation design and configuration is suitable for the GV Valve. If it is not, the GV Valve
may leak.
! Install flexible bellows in the pipeline to prevent the transmission of stress to the valve body during baking or
from the mass of the other components in your vacuum system.
For CF GV Valves, use copper gaskets to seal the valve.
For ISO and ANSI GV Valves, we recommend that you use trapped O-rings to seal a GV Valve with a flange size greater
than 50 mm (2 inches), unless you will use the GV Valve in an application where there must be no trapped volumes.
In these applications you can use Co-Seals, as long as:
! The valve body and the pipelines are supported so that there is even loading of the Co-Seal faces.
! The securing bolts are evenly tightened to a maximum torque of 5 Nm.
When you install a manual GV Valve, ensure that you can access the valve handle.
Install the GV Valve so that fingers or other parts of the body cannot get trapped by exposed parts
of the valve mechanism.
Install the GV Valve in clean conditions and wear clean lint-free gloves to touch the GV Valve. If you do not, the
GV Valve may be contaminated and may outgas when it is installed.
Use suitable clamps to fit GVI040 and GVI050 Valves, which have NW flanges.
All other GV Valves have two flanges, each of which has tapped holes. You must use bolts of the correct length to fit
the GV Valve. We recommend that you use bolts which are at least 6 mm (1/4 inch) shorter than the thickness of
both mating flanges and seal. If you use longer bolts, you will damage the body panels and the sealing surface of the
gate O-ring and the GV Valve may leak. Use the following procedure:
1. Remove the flange covers from the GV Valve and wipe the flanges and the gaskets with a clean, dry lint-free
cloth.
2. If you have O-ring seal flanges, apply a light wipe of high vacuum grease (such as Fomblin RT15) to the O-ring,
then fit the O-ring in the groove in the flange.
3. Place the GV Valve between the pipeline flanges and in the required orientation (refer to Section 3.2).
4. If you will bake the GV Valve, lightly grease the securing bolts with a suitable high temperature, anti-seize
compound.
5. Fit the securing bolts, then tighten them progressively and alternately (that is, tighten one bolt by a few turns,
then tighten the bolt on the opposite side of the valve, then tighten the bolt adjacent to the first bolt, and so
on) to the following maximum torques:
! Co-Seals: 5 Nm
! O-ring seals: 7 to 14 Nm
! CF flanges up to 63 mm (21/2 inch) outside diameter: 22 Nm.
If you do not tighten the bolts correctly, the GV Valve may leak.
Ensure that you control the release of compressed air when you connect or disconnect the
pneumatic supply, and unscrew and remove the check- valve. If you do, the sudden release of high
pressure air may cause injury.
The GV Valve is supplied with the pneumatic cylinder pressurised to secure the valve plate during transit:
! GV Valves with nominal flange size less than 200 mm (8 inches) are supplied with the GV Valve secured in the
open position; a check-valve is fitted to the pneumatic connection closest to the valve body to maintain the
pressure in the pneumatic cylinder.
! GV Valves with nominal flange size greater than or equal to 200 mm (8 inches) are supplied with the GV Valve
secured in the closed position; a check-valve is fitted to the pneumatic connection furthest from the valve
body to maintain the pressure in the pneumatic cylinder.
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B650-01-880 Issue G
1. Slowly unscrew the check-valve to release the pressure in the pneumatic cylinder. Do not fully unscrew the
check-valve.
2. When the pneumatic cylinder is at atmospheric pressure, remove the check- valve.
3. Use suitable components (refer to Section 2) to connect your pneumatic supply to the two pneumatic
connections on the double acting actuating cylinder on the GV Valve. Ensure that the connections comply with
all local pneumatic regulations, and that your pneumatic supply complies with the requirements of Section 2.3.
If it does not, you can damage the GV Valve. A typical pneumatic circuit is shown in Figure 5.
4. We recommend that you fit an electropneumatic control-valve accessory (refer to Section 7), to allow you to
adjust the opening and closing times of the GV Valve. Fit the electropneumatic control-valve as described in the
instruction manual supplied with the control-valve. If you fit a control-valve, you can fit the check-valve
(removed in Step 1 and 2) to the inlet of the control-valve, to maintain the GV Valve position if the pneumatic
supply fails (see Figure 5).
5. When you have connected the pneumatic supply to the GV Valve to the times shown in Table 1. If you do not, you
may damage the GV Valve when you operate it and it may leak. Refer to the instruction manual supplied with
your electropneumatic control-valve to adjust the opening and closing times.
Note:GVI***P pneumatic GV Valves have reed switches (see Section 3.5.2); all other pneumatic GV Valves have
microswitches (see Section 3.5.1).
3.5.1Valves with microswitches
The pneumatic GV Valve has two microswitches: a fully-open microswitch which operates when the GV Valve is fully
open, and a fully-closed microswitch which operates when the GV Valve is fully closed. Two black wires are
connected to the outputs of the fully-open microswitch and two white wires are connected to the outputs of the fully
closed microswitch. Connect these wires (Figure 2, item 1) to your control equipment. The signals on the wires are
used as follows:
! The signal on the white wires is normally open and closes when the GV Valve is fully closed.
! The signal on the black wires is normally open and closes when the GV Valve is fully open.
3.5.2GV valves with reed switches
The pneumatic GV Valve has two reed switches: a fully-open reed switch which operates when the GV Valve is fully
open, and a fully-closed reed switch which operates when the GV Valve is fully closed. A red and a black wire are
connected to each of these switches and to the electrical connector on the GV Valve (Figure 3, item 1). Use the
connector mating-half supplied to connect the outputs of the reed switches to your control equipment: refer to the
wiring diagram shown in Figure 6.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B650-01-880 Issue G
4Operation
4.1Manual GV valves
Note:There are two types of valve handle: a grasp type handle (Figure 1, item 1) fitted to 100 mm (4 inch) and
larger GV Valves, and a knurled handle (Figure 1, item 2) fitted to 75 mm (3 inch) and smaller GV Valves.
To open the GV Valve, turn the valve handle anticlockwise until you cannot turn it any more.
To close the GV Valve, turn the valve handle clockwise until you hear the GV Valve lock ‘over-centre’ in the fully
closed position. If you think that there is a leak across the valve plate seal, do not overtighten the valve handle to
stop the leak. When the gate mechanism has gone ‘over-centre’ to seal the GV Valve, any further tightening will
increase the leak rate across the plate seal and will damage the valve mechanism.
4.2Pneumatic GV valves
Operation
To close the GV Valve, slowly increase the pneumatic supply pressure to the valve from 0 psig
(1 bar absolute, 1 x 10
To open the GV Valve, slowly decrease the pneumatic supply pressure to the GV Valve to 0 psig
(1 bar absolute, 1 x 10
If you have not fitted a check-valve as described in Step 4 of Section 3.4, when the pneumatic supply fails or is vented
to atmosphere:
! A closed GV Valve will remain fully closed
! An open GV Valve will start to close but will not lock ‘over-centre’and fully close.
The outputs of the GV Valve position indicator microswitches can be used at all times to identify if the GV Valve is
fully open, fully closed or partly open (see Section 3.5).
5
Pa) until you hear the GV Valve lock ‘over-centre’ in the fully closed position.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B650-01-880 Issue G
6Storage and disposal
6.1Storage
Place protective covers over the valve flanges (and pneumatic ports, if applicable) and store the GV Valve in cool,
dry conditions until required for use.
When required, prepare and install the GV Valve as described in Section 3.
6.2Disposal
Dispose of the GV Valve and any components removed from it safely in accordance with all local and national safety
and environmental requirements.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B650-01-880 Issue G
7Service, spares and accessories
7.1Introduction
Edwards products, spares and accessories are available from Edwards companies in Belgium, Brazil, China, France,
Germany, Israel, Italy, Japan, Korea, Singapore, United Kingdom, U.S.A. and a world-wide network of distributors.
The majority of these centres employ Service Engineers who have undergone comprehensive Edwards training
courses.
Order spare parts and accessories from your nearest Edwards company or distributor. When you order, please state
for each part required:
! Model and Item Number of your equipment
! Serial number (if any)
! Item Number and description of the part
7.2Service
Edwards products are supported by a world-wide network of Edwards Service Centres. Each Service Centre offers a
wide range of options including: equipment decontamination; service exchange; repair; rebuild and testing to factory
specifications. Equipment which has been serviced, repaired or rebuilt is returned with a full warranty.
Service, spares and accessories
Your local Service Centre can also provide Edwards engineers to support on-site maintenance, service or repair of
your equipment.
For more information about service options, contact your nearest Service Centre or other Edwards company.
7.3Spares
Refer to Table 4 and 5 for the spares kits available for the GV Valves:
! Seals Kits contain gate O-ring, bonnet seal and pneumatic actuator O-rings.
! Bellows Kits contain bonnet/bellows/actuator link welded assembly, and circlip (as required).
! Pins and Bearings Kits contain pins, washers, bearings, springs and wheels (as required).
Table 4 - Spares for GV valves manufactured in 1996 and later