Vp522 Pneumatic Sequencing Water Valve; Sequencing - Honeywell Pneumatic Controls Engineering Manual

VP522 Pneumatic Sequencing Water Valve

Dimensions in inches (millimeters)
B
C
VALVE
A
SIZE
IN INCHES (mm) IN INCHES (mm)
9-13/16 (249) 5-1/8 (130)
3/8 IN.
9-15/16 (252) 5-1/8 (130)
1/2 IN.
9-15/16 (252) 5-1/8 (130)
3/4 IN.
Typical VP522 Operation Diagram
CONTROL
AIR
A
CHILLED
WATER
HOT
WATER
B
A
B C
IN INCHES (mm)
3-5/8 (92)
3-5/32 (80)
3-5/32 (80)
C4671A
VP522A
VALVE
N.O. PORTS
B TO AB
AB
COIL
Three-pipe, sequencing, pneumatically operated water valve for
controlling both hot and cold water flow in fan-coil and induction
units. Replacement devices are available for Johnson, Powers,
Robertshaw, Barber-Colman, and older Honeywell devices.
• Corrosion resistant.
• Molded-in composition discs for tight shutoff.
• Flare connections for easy installation.
• Operator rotates 360 degrees for convenient air piping alignment.
Operating Sequence on Control Air Pressure Increase
VP522A
3/8 IN. 1/2 IN. & 3/4 IN.
HOT PORT
HOT PORT
OPEN 100%
OPEN 100%
HOT PORT
HOT PORT
CLOSES
CLOSES
BOTH PORTS
BOTH PORTS
CLOSED
CLOSED
COLD PORT
OPENS
COLD PORT
OPENS
COLD PORT
COLD PORT
OPEN 100%
OPEN 100%
VP522B
VALVE
A
AB
B
70-6925
Valves
VP522B
AIR PRESSURE
psi (kPa)
ALL SIZES
0 (0)
HOT PORT OPEN
1 (7)
100%
2 (14)
3 (21)
4 (28)
5 (34)
HOT PORT CLOSES
6 (41)
7 (48)
8 (55)
BOTH PORTS CLOSED
9 (62)
COLD PORT OPENS
10 (69)
11 (76)
12 (83)
COLD PORT OPEN
13 (90)
100%
14 (97)
15 (103)
M13864
CONTROL
AIR
TO
CHILLER
TO
BOILER
M5447
99