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Types 634 and 634M
3. Remove the other special washer, diaphragm
heads (keys 5, 7 and 23), diaphragm (key 6) and
O-rings from the fracture disk (key 4) end of the
stem (key 10).
4. Slide the stem (key 10) out to gain access to the
O-ring (key 8) in its center recess.
5. Remove the special hex nut, lockwasher, plug
assembly, O-ring and special washer (keys 7, 8, 9,
16 and 17) from the plug end of the stem (key 10).
6. Inspect and replace parts as necessary.
7. Lubricate the recessed area of the stem (key 10)
with a suitable lubricant and then install the O-ring
(key 8) into the recessed area.
8. Install one special washer (key 7), O-ring (key 8),
plug assembly (key 9), lockwasher (key 16) and
special hex nut (key 17) onto the appropriate end
of the stem (key 10) as shown in Figure 6. Insert
the plug and stem assembly into the body (key 1).
9. Install the following over the fracture disk end of
the stem:
• The lower diaphragm head (key 23) with its
chamfered side facing away from the plug
assembly, followed by an O-ring (key 8);
• The diaphragm, followed by another O-ring
(key 8);
• The diaphragm head (key 5) with its chamfered
side facing toward the plug assembly;
• The other special washer (key 7);
• The other hex nut (key 12). Good assembly
practice includes tightening both hex nuts
(keys 12 and 17) to 6 to 8 ft-lbs / 8 to
11 N•m torque.
10. Apply a suitable thread sealant to the threads of
the pipe plug (key 13), and install the pipe plug
into the body (key 1).
11. Install the upper casing (key 2) so that the vent
assembly (key 22, not shown) is pointed down or
otherwise protected.
12. Install the cap screws (key 11). Before tightening
them, make sure that the plug assembly (key 9)
is closed in order to provide enough slack in
the diaphragm.
13. Tighten the cap screws (key 11) using a crisscross
bolting pattern. Good assembly practice includes
tightening the cap screws to 13 to 17 ft-lbs / 18 to
23 N•m torque.
6
14. Make sure that the disk retainer (key 3) and
attached parts are installed into the upper casing
according to steps 3 through 5 of the replacing
fracture disk procedure.
Parts ordering
When corresponding with a local Sales Office about
Types 634 and 634M shutoff valves, include the type
number and all other pertinent information stamped
on the disk retainer and casing. Specify the eleven-
character part number when ordering from the
following Parts List.
Parts list
key
description
Repair Kits (included are keys 4, 6, 8,
9 and 21)
With red fracture disk
With yellow fracture disk
With white fracture disk
1
WCC Steel Body
3/4 NPT
Type 634
Type 634M
1 NPT
Type 634
Type 634M
2
Upper Casing
Cast iron
3*
Disk Retainer
Steel
4*
Fracture Disk, Cast iron
Red color code
Yellow color code
White color code
5
Diaphragm Head
Plated steel
6*
Diaphragm
Neoprene (CR) and Nylon (PA) fabric
7
Special Washer
Plated steel (2 required)
8*
O-ring, Nitrile (NBR) (4 required)
9*
Plug Assembly
Aluminum and Nitrile (NBR)
10
Stem, Stainless steel
11
Cap Screw, Plated steel (8 required)
12
Hex Nut, Steel
13
Pipe Plug, Plated steel
14
Snap Ring
15
Pipe Plug, Plated steel (2 required
with standard construction or 1 required
with Tank Valve Inlet only)
15
Tank Valve (not shown), Plated steel
(1 required with Tank Valve Inlet only
or 2 required with standard construction
16
Lockwasher, Plated carbon steel
17
Special Hex Nut, Stainless steel
21*
O-ring, Nitrile (NBR)
22
Type Y602-12 Vent Assembly (not shown)
Plastic
23
Lower Diaphragm Head
Plated steel
*Recommended spare part.
Part number
R634X000012
R634X000022
R634X000032
39A1091X022
39A0584X022
39A1090X032
39A0585X022
29A0776X012
19A1935X022
29A1936X012
29A1936X022
29A1936X032
19A1937X012
19A1938X012
19A1940X012
1D6875X0022
19A1943X012
19A1941X012
1B787724052
1A345724122
1A794728992
12B9220X012
1A500828992
19A1951X012
1C225628982
19A1944X012
10A8931X012
27A5516X012
19A6901X012
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