Restek RAVEn User manual

Figure 1: A disassembled RAVE diaphragm valve.
Valve
body
Diaphragm
stack
Button
assembly
Bonnet Bonnet nut and
stem assembly
Handle with screw
and lock washer
RAVE and RAVEn Diaphragm Valves Rebuild Kit
cat.# 26389 and 26390
Contents
Each kit contains one preassembled stack of three diaphragms, one button assembly (button and button retainer), and one tube of lubricating grease. Valves and
other components are not included.
Disassembly Instructions
1. Before disassembling the valve, turn valve to open position to vent and eliminate any pressure.
2. Hold the valve body securely in a vise, and then open the valve completely by turning the handle counterclockwise. (Be certain the valve is fully in the open position.)
3. Remove the screw and lock washer from the stem; then remove the handle.
4. Loosen the bonnet nut using a 1”wrench or socket, making sure that the flat hex sides of the bonnet nut are fully engaged with the tool.
5. Remove the bonnet nut/upper stem assembly and retain them for reassembly. If the bonnet has adhered to the bonnet nut/upper stem assembly, remove the
bonnet and retain it.
6. Remove and discard both the diaphragm stack and the button assembly; do not reuse these components. Check the stem to ensure that the button assembly has
not adhered to it. A correctly disassembled valve is shown in Figure 1.
Assembly Instructions
1. Confirm that the valve cavity and sealing surface (valve seat) are free of damage and foreign
matter. Clean the valve, if necessary, following in-house procedures or using methanol and a
nonabrasive, low-lint clean cloth or wipe. An undamaged valve seat is shown in Figure 2; note
that a damaged valve seat may leak and is not repairable.
2. Hold the valve securely in a vise and insert the preassembled diaphragm stack into the valve,
dome side up (Figure 3). The dome side is indicated by a black dot on the top diaphragm.
3. Lightly lubricate the top diaphragm and the threads on the bonnet nut by applying a small
amount of the supplied grease directly from the tube. Extra lubricant is included in the tube;
do not use the entire amount.
4. Install the bonnet in the valve cavity with the stepped surface facing up toward the top of the
valve, and the shallow angled surface resting on the top of the diaphragm stack (Figure 4).
5. Prior to installing the button assembly, verify that the plastic button is firmly pressed into the
metal button retainer. If these items were dislodged during shipping, reinstall the button by
pressing it firmly into the retainer. When properly assembled, the button will be housed almost
entirely in the retainer.
6. Install the button assembly in the valve cavity by placing the button assembly into the bonnet
(Figure 5). When installed correctly, the side of the button assembly with the wider button
diameter will face down toward the diaphragm stack and the side of the button assembly with
the black dot and narrower button diameter will face up toward the top of the valve.
(continued)
Caution: Only experienced personnel should attempt to rebuild valves. Valves can be irreparably damaged if replacement parts are not
installed correctly.
Note: Follow the same instructions (below) to rebuild both RAVE valves (Restek air canisters) and RAVEn valves (Entech air canisters).
Figure 2: Inspect the valve
seat carefully to ensure that
it is clean and undamaged.
Figure 3: Preassembled
diaphragm stack installed in
valve (black dot goes up).
Figure 4: Bonnet installed
in valve on top of diaphragm
stack.
Valve seat
Figure 5: Button installed
into bonnet inside of valve
(black dot goes up).

7. Verify that the stem is fully retracted into the bonnet nut (Figure 6). Then, thread the bonnet
nut/stem assembly into the valve body until hand tight (Figure 7). Note that the valve can be
damaged if torque is applied when the stem is not fully threaded into the bonnet nut.
8. Tighten the bonnet nut with 92 ft/lb of torque using a torque wrench.
9. Press the handle onto the stem and reassemble the lock washer and screw (Figure 8).
10. Prior to use, perform a valve cycling procedure by first attaching the valve inlet to a 20 psi reg-
ulated purge gas source. While under purge, cycle the valve closed with a calibrated torque
wrench using 10 in/lb of torque. Repeat this step five times, allowing the purge gas to flow
through the valve when it is in the open position.
11. Perform appropriate seal integrity tests and clean the valve well prior to returning it to service.
Note that valve cleanliness can be compromised by repair; only a person thoroughly
familiar with the intended use of the valve should attempt to repair it.
Note: Replacement mounting screws are provided for use with RAVE valves installed on Restek
air sampling canisters. These screws are not required for RAVEn valves on Entech air sampling
canisters and can be disregarded.
Correct
Incorrect
Figure 6: The stem must be fully threaded (retracted) into
the bonnet nut before the bonnet nut/stem assembly is
installed or the valve may be damaged during installation.
Figure 7: Bonnet nut/stem
assembly installed in valve.
Figure 8: Handle reattached
to valve.
© 2017 Restek Corporation. All rights reserved. Printed in the U.S.A.
www.restek.com
#500-19-001 Rev. date: 01/17
Restek patents and trademarks are the property of Restek Corporation. (See www.restek.com/Patents-Trademarks for full list.) Other trademarks in Restek literature
or on its website are the property of their respective owners. Restek registered trademarks are registered in the U.S. and may also be registered in other countries.
Questions about this or any other Restek product?
Contact us or your local Restek representative (www.restek.com/contact-us).