9650 Valve Series
Installation and Maintenance Manual
26
4.5
CSA CLOSED/PROOF OF CLOSURE LIMIT SWITCH
Caution: following ANY valve maintenance it is required to fully test valve operation and to complete fps valve
automated valve repair check sheet FP081.0.
For all FPS CSA approved normally closed valves requiring closed/proof of closure (POC) limit switch, follow the steps
in the proof of closure limit switch setting section below.
Proof of closure limit switch setup:
This procedure is required on the following CSA approved automatic valves with POC limit switch.
Size
Part Number
½”
9650-0220-20xx-11yy-00z2
¾”
9650-0230-20xx-11yy-00z2
1”
9650-0240-20xx-11yy-00z2
1 ¼”
9650-0250-21xx-11yy-00z2
1 ½”
9650-0260-22xx-11yy-00z2
2”
9650-0270-22xx-11yy-00z2
xx = various solenoid options
yy = various end connection and seat options
z = various limit switch options
1)
The valve is checked to ensure that it is in its de-energized and “Normally closed” state
2)
The bottom limit switch (Closed/POC) in the limit switch enclosure is adjusted so that the NO contact (Terminals
5&6) is closed.
3)
The upstream side of the valve body is pressurized to 300psig
4)
The valve solenoid is energized.
5)
Instrument air is applied to the valve solenoid and the instrument air pressure is raised in order to have the
valve open slowly.
6)
As the valve is opening, the bottom limit switch (Closed/POS) in the limit switch enclosure NO contact
(Terminals5&6) must open prior to any leakage of the 300psig air through the valve.
7)
Leakage through the valve is verified by means of a bubble flow meter on the downstream side of the valve,
leakage must be zero.
8)
The valve solenoid is de-energized.
9)
As the valve is closing the bottom limit switch (Closed/POC) in the limit switch enclosure NO contact (Terminals
5&6) is checked to ensure that it is closed only when flow across the valve ceases.
10)
The limit switch is sealed via a rubberized compound.
11)
Instrument air pressure is set to 70psig.
12)
The valve is stroked 10 times and checked for proper operation of all components including limit switch, solenoid
operation, actuator operation and valve operation.
13)
Following limit switch reassembly, refer to section 7 for valve testing.
