Submittal Sheet

SERVICE DATA
75-5544EF
® U.S. Registered Trademark
Copyright © 2003 Honeywell • All Rights Reserved
VP525A,C
Pneumatic Radiator Valves
GENERAL
Description
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(superseded by VP531 Valves).
APPLICATION
These valves typically provide control of two-pipe water or
steam systems.
OPERATION
An increase in branchline pressure from a thermostat causes
the valve to close proportionally, modulating the flow through
the valve (Fig. 1). 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.
Fig. 1. Typical valve operation.
SPECIFICATIONS
Action: Normally open, air pressure to close.
Capacity Index: See Table 1.
Operating Range: See Table 1.
Close-Off Rating: See Fig. 2 and 3.
Construction:
Body: Cast bronze.
Stem: Stainless steel, 3/16 in. (5 mm) diameter.
Packing: Teflon, spring loaded, self adjusting.
Seats:
Solder body: Integral only.
Threaded body: Integral on 3.0 and 3.5 Cv, 1/2 in. valves.
(removable on all others).
Flow Characteristics: 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).
Actuator: Rolling diaphragm type.
Air Connection: Integral, for 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).
T
HERMOSTAT
B
RANCHLINE
N.O
.
C465
4
SYSTEM
SUPPLY