Val-Matic Swing Check Valve - Manual (Page 10)

VAL-MATIC'S SWING CHECK VALVE
OPERATION, MAINTENANCE AND INSTALLATION
Page 10 of 13
RE-ASSEMBLY
All work on the valve should be performed by a
skilled mechanic with proper tools and a power
hoist for larger valves.
VALVE RE-ASSEMBLY
1. Lubricate body seat o-ring (23) and body seat
(11) with an FDA grease such as Lubriko
#CW-606. Install body seat o-ring (23) and
body seat (11). In 12” and smaller valves, the
seat (11) is screwed into the body. In 14” and
large the seat (11) is held into the body with
set screws (12). Remove he body seat (11),
set screws (12), and o-ring (23)
2. Install rubber seat (8), seat retaining segments
(7), washers (9), and seat retaining bolts (10)
onto disc. Torque bolts to values listed in
Table 4 below. Note: Take caution to protect
the rubber seat from damage during the
remainder of the assemble process.
3. Assemble yoke arm (4), retaining rings (25),
disc pins (24), and disc (3).
4. Sling and support yoke arm (4) and disc (3).
5. Lift and hang the supported yoke arm (4) and
disc (3) and place into body (1) with yoke
hinge boss nestled in the hinge pin recess
area.
6. Install hinge pin (5) and yoke key (6) from
keyed end engaging the key into the keyway
of the yoke (4). Note: The hinge pin may be
installed with the key oriented toward either
side of the valve. The keyed end of hinge pin
(5) must be oriented to the side where the
spring assembly, lever & weight assembly,
and /or air cushion assembly is to be mounted.
7. Install bushings (14) from both ends of hinge
pin (5).
8. Push hinge out the non-keyed end of the
hinge pin until the retaining ring (21) can be
installed and install the retaining ring.
9. Push hinge (5) back into the body until
retaining ring (21) is seating at the back of the
bushing (14). Install bolts, (20) washers (19)
and o-ring (22) with blind hinge cover (18-2).
10. Install packing (16) and packing shim (15).
11. Install bolts (20) and washers (19) with
through hinge cover (18-1).
12. Install stop bolt (60), washer (61) and nut (62).
Set at desired extension length.
13. Lubricate cove o-ring (26) and grove on top of
body (1) with an FDA grease such as Lubriko
#CW-606. Install o-ring (26) on top of body
(1). Place cover (2) on top of body in the
correct orientation with the flow arrow pointing
away from the hinge pin.
14. Install cover bolts (28), washers (27), and nuts
(29). Torque bolts and nuts to the values
listed in Table 5 below in several graduated
steps using the cross-over bolt tightening
method.
15. Install pipe plugs (13) are not installed into
body (1) and Cover (2) if not already installed.
Note: Vent, drain and/or air release valves
may also be installed into these ports in lieu of
the pipe plugs furnished.
16. If desire, pressure test the body for packing
and cover leaks. Adjust or replace as
necessary.
17. Install spring assembly, lever and weight
assembly and/or air cushion assembly.
SPRING RE-ASSEMBLY
1.
For safety, wrap, restrain and tie the spring
(50) with rags, slings, or rope in case of a
sudden release.
2. Install spring bracket (53), bolts (55) and
washers (56).
3. Install Key (54).
4. Install Lever (51).
5. Install Spring (50).
6. Carefully Install nut (57) and spring bolt
(52). Set nut (57) and spring bolt (52)to the
desired tension setting
WEIGHT AND LEVER RE-ASSEMBLY
1.
Install weight and lever and cylinder bracket
(40), bolts (46) and washers (47).
2. Install key (32).
3. Install lever (30). Note: Lever has multiple
Table 4. Seat Retaining Bolt Torque
Valve Size Bolt Size Torque (ft-lbs)
2” to 4” M5 5
6” to 20” M8 10
24” to 48” M10 20
Table 5. Cover Bolt Torque
Valve Size Bolt Size Torque (ft-lbs)
2” to 2 ½”
M10 50
3” to 4” M12 75
6” to 18” M20 250
20” to 36” M24 500
42” to 48” M30 750