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.

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?