Honeywell Pneumatic Radiator Valves, VP531C1067
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VP525A, C Pneumatic Radiator Valves
The VP525A,C Pneumatic Radiator Valves are normally open, single-seated valves with straight-through or angle-body construction. The VP525A rating is 180°F (82°C) maximum and the VP525C rating is 240°F (116°C).
NOTE: Solder-body VP525A Valves are obsolete (superseded by VP531 Valves).
These valves typically provide control of two-pipe water or steam systems.
An increase in branchline pressure from a thermostat causes the valve to close proportionally, modulating the flow through the valve. The valve is fully open when the branchline pressure is at or below the actuator range low end and is fully closed when the branchline pressure is at the high end.
Action: Normally open, air pressure to close
• Body: Cast bronze
• Stem: Stainless steel, 3/16 in. (5 mm) diameter
• Packing: Teflon, spring loaded, self adjusting
--Solder body: Integral only
--Threaded body: Integral on 3.0 and 3.5 Cv, 1/2 in. valves (removable on all others)
• Modified linear
Body Pressure Rating (Nominal):
• Solder body: 250 psi (1724 kPa)
• Threaded Body: 150 psi (1034 kPa)
Controlled Medium Temperature:
• VP525A: 180°F (82°C) maximum
• VP525C: 240°F (116°C) maximum
• Maximum allowable difference for alternating hot and cold water: 140°F (78K)
Maximum Pressure Differential for Quiet Service and Normal Life of Disc and Seat:
• Water: 20 psi (138 kPa)
• Steam: 10 psi (69 kPa)
• Rolling diaphragm type
• Integral, 1/4 in. (6 mm) O.D. plastic tubing
Maximum Safe Air Pressure:
• 30 psi (207 kPa)
Maximum Safe Diaphragm Temperature:
• 230°F (110°C)
Vp525 Capacity Index, Pressure Range, and Fitting Sizes:
² Quick-opening flow characteristic
Replaces Part Number: VP531C1067