Control valves
Control valves
Local regulations may restrict the use of this product to below the conditions quoted.
In the interests of development and improvement of the product, we reserve the right to change the specification without notice.
© Copyright 2012
TI-P373-14
CH Issue 4
PF51G
Bronze Piston Actuated
On/Off Valves
Description
A 2-port pneumatically actuated on/off bronze valve for use on
water, air, oil and gases. It can also be used on lower specification
steam applications.
A pneumatic signal acts on the actuator piston to open or close
the valve with a spring return action. The valve plugs have a PTFE
soft seal (G) to provide a tight shut-off. A valve position indicator
is included on standard and flow regulator models.
Valves are available with one of three sizes of actuator:
Type 1 (45 mm), Type 2 (63 mm) and Type 3 (90 mm) with the
following action options:
- NC (Normally Closed)
These valves are designed for flow over the seat (port 1 to 2).
Caution: Not recommended for waterhammer prevention.
- NO (Normally Open)
These valves are designed for flow under the seat (port 2 to 1).
Can be used to prevent waterhammer on valve closure in liquid
applications.
- BD (Bi-Directional normally closed)
These valves are designed for special applications that require
flow in both directions and incorporates an anti-waterhammer
design for liquid applications flowing under the seat
(port 2 to 1). Note: To help prevent the possibility of
waterhammer on liquid applications flowing over the seat
(port 1 to 2) the pressure should not exceed 1 bar g.
Optional extras
(see 'Valve selection guide', page 7)
:
- Travel switch.
- Flow regulator.
Available range - sizes, pipe connections and actuator combinations
Valve Pipe
type
connections
Screwed
PF51G
BSP or NPT
Valve
Actuator
action
type
Model
1⁄2"
3⁄4"
Sizes
1"
11⁄4" 11⁄2"
2"
NC - Normally Closed
(flow over seat)
1
PF51G - 1NC
•
•
•
2
PF51G - 2NC
•
•
3
PF51G - 3NC
•
•
•
•
•
•
•
•
NO - Normally Open
1
PF51G - 1NO
•
•
•
(flow under seat)
2
PF51G - 2NO
•
•
3
PF51G - 3NO
•
•
•
•
•
•
•
•
1
PF51G - 1BD
•
•
•
BD - Bi-Directional normally closed
(flow over or flow under seat)
2
PF51G - 2BD
•
•
3
PF51G - 3BD
•
•
•
•
•
•
•
•
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