User Guide

F-24396-1 © Copyright 2006 TAC All Rights Reserved. 5
For example, if a valve is controlling 200°F water at an inlet pressure of 18 psig, the
maximum pressure drop allowable would be:
Pm = 0.5 [(18 + 14.7) – 11.53] = 10.6 psi
(Vapor pressure of 200°F water is 11.53 psia.)
If the pressure drop for this valve is less than 10.6 psi, cavitation should not be a problem.
Systems where cavitation is shown to be a problem can sometimes be redesigned to provide
lower inlet velocities. Valves having harder seat materials should be furnished if inlet
velocities cannot be lowered.
Table-5 Vapor Pressure of Water Table.
Additional Valve
Sizing Information
For additional valve sizing information, see:
CA-28 Control Valve Sizing, F-13755
Valve Selection Chart Water, F-11080
Valve Sizing Slide Rule, TOOL-150
INSTALLATION
Inspection Inspect the package for damage. If damaged, notify the appropriate carrier immediately.
If undamaged, open the package and inspect the device for obvious damage. Return
damaged products.
Requirements Training: Installer must be a qualified, experienced technician
Appropriate accessories
Caution:
Install the valve with the flow in the direction of the flow arrows (“A” and “B” ports are
the inlets and “AB” port is the outlet except when used as a return valve). Refer to
Figure-3 and Figure-4.
Do not exceed the ratings of the device.
Avoid locations where excessive moisture, corrosive fumes, or vibration are present.
Mounting 1. The valve should be mounted in a weather protected area in a location that is within the
ambient limits of the actuator. When selecting a location, allow sufficient room for valve
linkage, actuator, and other accessories and for service of the product.
2. The preferred mounting position for the valve is with the valve stem vertical above the
valve body. Avoid mounting the valve so that the valve stem is below horizontal.
3. The VB-7332 series of flared valve bodies conform to SAE 45°.
Water
Temp.
(°F)
Vapor
Pressure
(psia)
Water
Temp.
(°F)
Vapor
Pressure
(psia)
Water
Temp.
(°F)
Vapor
Pressure
(psia)
Water
Temp.
(°F)
Vapor
Pressure
(psia)
40 0.12 90 0.70 140 2.89 190 9.34
50 0.18 100 0.95 150 3.72 200 11.53
60 0.26 110 1.28 160 4.74 210 14.12
70 0.36 120 1.69 170 5.99 220 17.19
80 0.51 130 2.22 180 7.51 230 20.78