Option: Pressure Safety Switch Unit; Pressure Safety Switch Unit Design And Specifications - Flowserve NAF ProCap User Instruction

NAF ProCap Capping Valve User Instruction – FCD NFENIM4155-00-A4 11/18
At delivery, the ProCap is also:
• Prepared for stem seal surveillance: In the covers (Fig 18, item 50 and 51) there
are G ¼" ports that are plugged at delivery. In these ports, it is possible to
connect a pressure gauge, or pressure transmitter, for indication of pressure due
to a leakage over the stem seals. Alternatively, it can also be used for sealing
water.
• Prepared for segment flushing: Built into the clamp ring (Fig 18, item 8) there is a
G 1" pipe connection where water for flushing can be connected. Please see
Section 5.6 for more details. At delivery, the connection has been plugged.
5.2

Option: Pressure Safety Switch Unit

As an option, a Pressure Safety Switch Unit can be delivered with the valve. It is delivered
with two pressure switches which also can be integrated with the NAF ProCap Local
Control Box. By having a double pipe connection, pressure can be detected even if
one pipe is blocked. The Pressure Safety Switch Unit can be cleaned while in service as
it comes with a connection for flushing water.

5.2.1 Pressure Safety Switch Unit design and specifications

The Pressure Safety Switch Unit has a total of five ball valves integrated into a pipe loop
with a flange connection.
• Flange connection: DN 80
• Flange material: EN 1.4401/1.4436
• Ball valves:
o Feed pipes: 2 pcs NAF Triball DN 25, PN 40, PTFE seated in EN 1.4408
o Pressure switch and water connections: NAF Triball DN 15, PN 40, PTFE
seated in EN 1.4408. Threaded female connection Rp ½"
• Pressure switches: 2 pcs, female NPT ½" in 316 stainless steel, DPDT circuitry
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