DeZURIK
APCO CSD-800 Slanting Disc Check Valves
July 2017
Page 13
D12012
Operation
(Continued)
3. Open the two Flow control Valves (64) connected to the dashpot piping adjacent to the cylinder
in the following manner:
a. Fully open Flow Control Valve located at the top of the dashpot piping which controls the
rate of opening.
b. Open the Flow Control Valve located at the bottom of dashpot piping, which controls the
rate of closing, three complete turns counterclockwise from fully closed position. See
“Adjustment of Flow Control Valve”.
4. Turn cushion adjustment screw on the dashpot cylinder (59) one complete turn
counterclockwise from fully closed position. See “Operation of Internal Cushion”.
5. Start pump and observe rate of opening.
6. Shut down pump and observe rate of closing.
7. Using the above trial run as a basis, make necessary adjustments on the Flow Control Valves to
suit the installation. Over control of the opening cycle of the Slanting Disc Check Valve can
damage the connecting rod (55). Therefore, the Flow Control Valve (64) (step 3a) controlling
the opening cycle must never be closed less than two full turns open.
8. Tighten set screw or lock nut under both Flow Control Valve knobs when final setting is made to
prevent tampering of settings.
UNDER NO CIRCUMSTANCES SHOULD EITHER OF THE FLOW CONTROL VALVES
BE FULLY CLOSED WHEN THE PUMP IS BEING STARTED
Adjustment of Flow Control Valve
The Flow Control Valve, Figure 3, has a micrometer type adjustment which incorporates a color coded
reference scale to simplify setting, resetting and adjusting.
A set screw on the knob (see Figure 3) is provided for locking the valve setting. Turning the knob
clockwise
closes the valve and turning counterclockwise opens the valve and increases rate of closure
of the Check Valve.
Figure 3: Flow Control Valve