Cla-Val 582SWS Series - Manual (Page 3)

MAINTENANCE
Two Door Check Valves require no scheduled lubrication or
maintenance.
INSPECTION:
Periodic inspection for leakage can be performed by listen-
ing or leakage noise from the valve while the pump is shut
down. If leakage is heard, drain the pipeline, remove the
valve, and inspect the seating surfaces for wear of damage.
If the resilient seat is damaged, replace the valve or return
the valve to the factory for refurbishing.
TROUBLE SHOOTING
Several problems and solutions are presented below to
assist you in troubleshooting the valve assembly in an
efficient manner.
Valve Chatters or Vibrates:
Verify velocity is at least 4 ft/sec. (consult factory for air service). A
partially open valve will wear prematurely. Verify there are three
diameters of straight pipe upstream.
Valve Leakage:
Check upstream gasket and flange bolt torque for flange leakage.
Drain line, remove valve and inspect seating surfaces.
Valve Does Not Pass Flow:
Check flow arrow direction on valve body is correct. Verify down-
stream isolation valve is open and there is no line blockage down-
stream.
Valve Slams:
Remove valve and inspect spring. Heavier springs can be furnished
for severe high-head applications. Consult factory if the valve is
installed in a vertical pipe with the flow downstream.
Pump discharge lines may have trapped air.
DISASSEMBLY:
The valve must be removed from the pipeline for repair. All work on
the valve should be performed by a skilled mechanic with proper
tools. Refer to Figure 3, page 2.
WARNING:
The line must be drained before removing the valve or pressure
may be released causing injury.
1. remove the valve from the pipeline. NPS 10-12 (DN 250-300)
valves are provided with a lifting eyebolt to aid in this process. Lay
valve on flat surface or bench with the flow arrow facing upwards.
2. Remove the retainer set screws (7) & (8) and the rubber
spheres (9). The retainer set screws are metric and should be
removed, using standard metric hex drive bits or wrench.
3. Drive out the pins (4 & 5) with a round bar or punch while pressing
down on the spring (3) to prevent it from unwinding.
Warning: Valves 18" and larger have 2 springs and require
extreme care to prevent rapid uncoiling of the spring during disas-
sembly. Restrain the spring with boards and clamps during disas-
sembly.
4. Lift doors (2) from body. Inspect pins and seating surfaces for
wear. The shaft diameter is normally about 1/16" (1.5mm) smaller in
diameter than the hole in the disc lugs. Some minor dents and dis-
colorations are normal. Wear areas in the Buna-N
® resilient seat
will cause leakage and require valve to be returned to Cla-Val facto-
ry to be refurbished.
5. Inspect spring (3) for wear or cracks.
REASSEMBLY:
All parts must be cleaned and gasket surfaces cleaned with a stiff
wire brush in the direction of the serration or machine marks. Worn
parts, gaskets and seals should be replaced during reassembly.
1. Lay body on flat surface with arrow facing upwards. Carefully
place the two doors with the machined sealing surfaces down on
the body sealing surface. Align the door lugs with the pin holes in
the body.
2. Insert the door hinge pin into the hole on one side of the body
but not through the door lugs. Install a spacer (10) between the
inside diameter of the body and the door lug. Push the door hinge
pin further to engage the first door lug.
3. Install a thrust bearing (6) between the first and second door
lugs and push the pin further to engage the second door lug.
4. While holding the torsion spring (3) with one of the ends facing
you, wind the rear tab 180 degrees in a clockwise direction and
then press the spring between the two sets of door lugs. Engage
the pin further to retain the spring and the third door lug. The legs
of the spring should apply a downward force on the door.
Note: 18” and larger valves have two springs and require extreme
care to prevent rapid recoiling of the springs. Restrain the spring
during assembly with boards and clamps. See Fig. 4, page 2.
5. While pushing the pin further, install the third thrust bearing (6),
the fourth door lug and than the second spacer (10). The pin
should now be centered in the body and the door should
rotate without binding.
6. Insert the door stop pin (5) into the holes in the body.
7. Insert a stabilization sphere (9) into each of the four holes pin
holes. 48" and larger valves will have rubber washers instead of
spheres.
8. Place a small amount of pipe thread sealant such as Loctite
PST on the retainer pipe plugs (7 & 8) and tighten in place. 48" and
larger valves will have o-rings for two of the plugs instead of
tapered threads.
9. Stand the valve on its edge with pins vertical and verify smooth
operation of the valve before installation into the pipeline. Apply a
light coat of silicone grease on the rubber seat for air service valves
(Series 582A).
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