Val-Matic Swing Check Valve - Manual (Page 6)

VAL-MATIC'S SWING CHECK VALVE
OPERATION, MAINTENANCE AND INSTALLATION
Page 6 of 13
INITIAL SETTINGS
1. Before starting pump and placing valve into
service, care must be taken to insure that the
pump's intake structure is free of foreign
objects such as lumber, tools, rocks, etc.,
which can damage the swing check valve.
2. If equipped with a side mounted air cushion,
the upper (cylinder rod end) external speed
control valve of the side mounted air cushion
will be factory set in the full closed position
and the lower (cylinder cap end) external
speed control valve of the side mounted air
cushion will be factory set in a full open
position. These settings provide a pressure
boost to the initial portion of the closing stroke.
3. If equipped with a weight and lever, connect
the weight as far as possible from the center-
line of the hinge pin and bolt to hold the weight
secure.
4. If equipped with a spring assembly, connect
the spring as far as possible from the center-
line of the hinge pin and the tension of the
spring should be adjusted with the bolt to hold
the spring secure.
TROUBLESHOOTING
Several problems and solutions are presented
below to assist you in troubleshooting the valve
assembly in an efficient manner.
 Leakage at Hinge Pin: Adjust or replace
packing.
 Leakage at Cover or Flanges: Tighten cover or
flange bolts, replace cover seal or flange
gasket.
 Valve Leaks When Closed: Inspect disc
rubber seat for damage or debris. Clean or
replace as needed. Inspect body stainless
steel seating surface for damage or debris.
Clean, polish, or replace as needed.
 Valve Does Not Open: Check for obstruction
in valve or pipeline; see disassembly
procedure. Operating pressure may be less
than cracking pressure. If less than 0.5 psig,
review application with factory.
DISASSEMBLY
The valve can be disassembled without removing
it from the pipeline. The valve may also be
removed from the pipeline. All work on the valve
should be performed by a skilled mechanic with
proper tools and a power hoist for larger valves.
Disassembly may be required to inspect the disc
for wear or the valve for debris or deposits.
Refer to Figure 2 for parts identification. Always
relieve pressure and drain pipeline before working
on the valve.
SPRING REMOVAL
1. For safety, wrap, restrain and tie the spring
(50) with rags, slings, or rope in case of a
sudden release.
2. Carefully remove nut (57) and spring bolt (52).
Note: The spring bolt (52) may be match
marked to assure re-assembly to the same
tension setting.
3. Remove Spring (50).
4. Remove Lever (51).
5. Remove
Key (54).
6. Remove spring bracket (53), bolts (55) and
washers (56).
WEIGHT AND LEVER REMOVAL
1. Support or prepare to lift weight (31).
Carefully remove nut (35), washer (36), and
bolt (34).
2. Remove weight (31). Note: Mark or record
the weight (31) location on the lever arm (30).
3. Remove bolt (33) and lever (30).
4. Remove Key (32).
5. Remove weight and lever and cylinder bracket
(40), bolts (46) and washers (47).
CAUTION
These initial settings provide the fastest
check valve closure.
The closure time should be selected,
tested, set, and determined by the user or
his designee who is expert in the installed
piping system as the system’s response to
the valve’s closure can vary greatly and the
system induced transient pressure can
cause severe damage to the valve and
other piping system components.
WARNING
The pipeline must be relieved of all
pressure and drained before removing the
valve or the valve cover or pressure may be
released causing bodily harm.