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Block Valves: Instruction Manual for All Sizes
D
R
A
FT 9/
21
/04
1-17
To reassemble the valve:
NOTE
When completely rebuilding the valve, be sure to reassemble
with new O-rings, quad ring, and cylinder cup.
1. Wipe all O-rings (12 and 13; 14 and 15) clean and very lightly grease them with Dupont
Krytox
®
GPL207 vacuum lubricant.
2. Secure the bellows and seal disc (11; 11, 12 and 13) in a vise as described in
disassembly procedures, step 13.
3. Place the O-ring (12 – large valve only) into its groove on the bellows and seal disc (11).
4. Place the washer (10) into the bellow and over the seal disc threaded stud (11; 13) with
the stepped side facing up. This washer is used to center the spring on bellows
assemblies without a boss machined into the seal disc.
5. Take the valve stem (8) in hand, apply Loctite
®
242 adhesive to the first three female
threads.
6. Thread the valve stem (8) onto the threaded rod of the seal disc (11) by turning the stem
clockwise until finger-tight.
7. Place the spring (9) over the stem so it is seated on the special washer (10). This washer
is required only in older model valves.
8. Proceed to:
❑
Step 9 if resassembly of the air cylinder is necessary.
❑
Step 15, if resassembly of the air cylinder is not required.
9. Lubricate the quad ring (7) liberally with Sta-lube 3120 grease. The piston cup (5) has a
rubber-coated bottom surface and a metal upper surface (Figure 1-8). Apply Sta-lube
liberally to the side walls and the rubber-coated bottom surface, leaving the metal top
surface dry.
Figure 1-8
Position of Quad Ring In its Groove
Piston Cup
Metal Surface
Quad Ring
Rubber Coated Bottom
Содержание L6280
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