7 New Honeywell VP531 Pneumatic Valves From DtiCorp.com

Normally-open, single-seated valve provides proportional control of steam or hot or cold water in terminal units. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.

Fort Lauderdale, FL - Popular Honeywell online retailer DtiCorp.com (http://www.DtiCorp.com) is introducing 7 brand new Honeywell VP531 Pneumatic Valves. The VP531A,C Terminal Unit Valves are normally-open, single-seated valves that provide proportional control of steam or hot/cold water in terminal units. These valves are available with threaded NPT or soldered end connections. The VP531A is intended for control of water at a maximum of 180°F (82°C). The VP531C is intended for water or steam at a maximum of 240°F (116°C).

The valve should be installed so the stem is anywhere between upright and horizontal. The actuator cannot be lower than the body. The direction of flow must be in the same direction as the arrow on the valve body. Be sure to allow enough clearance around the actuator top for servicing the valve after installation.

Series 2 VP531C Valves are built with a green (2-5 psi) actuator spring. Shipped with the valve is a loose orange (3-10 psi) spring. If desired, replace the green spring with the orange. To make this change remove the cover fastener. Before using the orange spring, make sure it can provide adequate close off for the application.

Connecting the valve without removing the internal assembly can overheat and damage the plug and packing beyond repair. Remove the top and insert assembly before connecting the VP531 soldered body valve. The valve is shipped with a loose bonnet nut allowing easy removal of the top and insert assembly. Lift the assembly out before soldering the valve into place. When soldering is completed, replace the top and insert assembly and tighten the bonnet nut firmly enough to compress the copper washer seal (35 to 45 ft-lb torque).


- Available in several capacities and spring ranges for various application requirements.
- Easily replaceable actuator assembly for convenience of service.
- Compact size for use inside most unit enclosures.


- Dimensions Pipe centerline to top of actuator: 3 1/2 in. Face-to-face: 2 9/32 in.
- Body: Cast bronze.
- Body Pattern: Two-way
- Disc and plug:
- VP531A: Rubber.
- VP531C: Teflon and brass.
- Seat: Bronze; integral with body.
- Stem: Stainless steel, 3/16 in. (5 mm) diameter.
- Bonnet nut seal: Reusable copper ring.
- Valve Action: Proportional Normally Open
- Packing:
- VP531A: Rubber, spring-loaded, self-adjusting.
- VP531C: Teflon, spring-loaded, self-adjusting.
- Controlled Medium Temperature (maximum):
- VP531A: 180°F (82°C).
- VP531C: 240°F (116°C).
- 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 (VP531C only): 10 psi (69 kPa).
- 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).
- Close-off Ratings at Branch Line Pressure: 70 psid at 20 psi (with 2 to 5 psi spring)
- Actuator: Rolling diaphragm type.
- Flow Characteristics: Modified equal percentage.
- Body Pressure Rating (maximum): 150 psi (1034 kPa).

Julian Arhire
Manager DtiCorp.com
Phone: 954.298.2515
Fax: 954.206.0767
Web: http://www.DtiCorp.com



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