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Normally-open, single-seated pneumatic radiator valve, with straight through or angle body construction provides proportional control of two-pipe, hot water or steam systems. Replacement devices are available for most models.


  • Available in several capacities and spring ranges for various application requirements.
  • Easily replaceable actuator assembly for convenience of service.
  • Compact size for installation where space is limited.
  • Can be repacked without shutting down system.

Product Specifications

Dimensions (in.)
4 7/8 in. high x 3 3/4 in. wide
Dimensions (mm)
124 mm high x 92 mm wide
Temperature Range (F)
40 F to 240 F; Maximum Safe Actuator Diaphragm Temperature--230 F
Temperature Range (C)
4 C to 116 C; Maximum Safe Actuator Diaphragm Temperature--110 C
2-5 psi spring is packed in box
Replacement for VP525A1218 and VP525A1226
Operating Humidity Range (% RH)
5 to 95% RH
Connection Size (in.)
3/4 in.
Connection Type
NPT- Angle Male union
Body Pattern
Spring Range (psi)
3 psi to 10 psi
Spring Range (kPa)
21 kPa to 69 kPa
Air connections
Push on for 1/4 in. O.D. plastic tubing
Capacity (Cv)
5 Cv
Capacity (Kv)
4.32 Kv
Valve Action
Proportional Normally Open
Valve Type
Body Pressure (psi)
150 psi
Body Pressure (kPa)
1034 kPa
Maximum Diaphragm Pressure (psi)
30 psi
Maximum Diaphragm Pressure (kPa)
205 kPa
Controlled Fluid
Close-off Ratings at Branch Line Pressure
42 psid (290 kPa) at 20 psi (138 kPa)
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