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SPECIFICATIONS
Body Pressure Rating (maximum): 150 psi (1034 kPa).
Controlled Medium Temperature:
VP531A: 180°F (82°C) maximum.
VP531C: 240°F (116°C) maximum.
Maximum Difference for Alternating Hot and Cold Water:
140°F (78K).
Maximum Safe Air Pressure: 30 psi (207 kPa).
Maximum Pressure Differential (for quiet service and
normal life of disc and seat):
Water: 20 psi (138 kPa).
Steam (VP531C only): 10 psi (69 kPa).
Close Off Ratings: See Fig. 5.
VP531A,C PNEUMATIC TERMINAL UNIT VALVES
ACTUATOR
SPRING RANGE
psi (kPa)
7
12
(48)
(83)
9
14
(62)
(97)
11
16
(76)
(110)
13
18
(90)
(124)
15
20
(103)
(138)
17
22
(117)
(152)
19
24
(131)
(165)
21
26
(145)
(179)
23
28
(159)
(193)
25
30
(172)
(207) 0
(0)
(138)
DIFFERENTIAL PRESSURE CLOSE OFF RATINGS
Fig. 5. VP531A,C close off ratings.
3
VP531A,C CLOSE-OFF AT
MAXIMUM SYSTEM PRESSURE
VP531A
VP531C
20
40
60
80
100
120
(276)
(414)
(552) (689)
(827) (965)
psi (kPa)
140
C7715A
95-7251EF–1
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