Control systems Control valves
4
Valve selection guide Valve size
DN15 ( ½ "), DN20 ( ¾ "), DN25 (1"), DN32 (1 ¼ "), DN40 (1 ½ ") and DN50 (2")
DN25
Valve type
P
P
= Piston valve
Valve characteristic
F
F
= Fast opening
Body material 5
5 1
= Bronze
1
= Screwed
BSP or NPT
Valve plug seal
G
G
= PTFE
1 2 3
= 45 mm (1.8") diameter
(for valve sizes ½" to 1")
Actuator type
2
= 63 mm (2.5") diameter
(for valve sizes ½" to 2")
= 90 mm (3.5") diameter
(for valve sizes 1" to 2")
NC
= Normally Closed
Valve position
NO
NC
= Normally Open
BD
= Bi-Directional
Blank = No options required
Provides indication of open or closed valve position through a magnetic reed switch with volt free contacts. Voltage (V) = 500 V, Current ( I ) = 0.5 A, Power (P) = 30 VA. Available on Type 2 and Type 3 actuators with suffix 'I' if this option is required. Maximum rating: Provides manual control of maximum flow through the valve. Can also provide manual shut-off on normally open valves. Available on Type 2 and Type 3 actuators with suffix 'R' if this option is required.
4.1 155
I
= Travel switch
Optional
R
= Flow regulator
Note: Shaded areas represent fixed parameters
Valve selection guide example
DN25-P-F-5-1-G-2-NC-
-
Screwed BSP
How to order Example: 1 off Spirax Sarco 1" PF51G-2NC bronze piston actuated on/off valve having screwed BSP connections.
Spare parts A seal kit is available for all valve and actuator sizes comprising: Piston lip seal, stem 'O' ring, valve head seal (PTFE), body seal. How to order spare seal kits Always order spares by specifying the valve size, type and date code (given on the actuator label i.e. 120 = week 12, year 2000). Example: 1 off Seal kit for a 1" PF51G-2NC, date code 120. Safety information, installation and maintenance For full details, see the Installation and Maintenance Instructions supplied with the product. Installation note: These valves can be mounted in any orientation. The actuator can be rotated 360° in the direction indicated on the product label to facilitate easy pilot mounting connection.
TI-P373-14 CMGT Issue 7
Page 11 of 12
PF51G BronzePiston Actuated On/Off Valves
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