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A
pplication Overview
The V43 water regulating valves are pilot operated,
provide for modulating operation, and are available for
commercial and maritime applications. They are
typically used to regulate water flow for condensers
requiring a large flow capacity. The V43 valves
automatically open when the refrigerant pressure
increases and modulate the flow of cooling water
through the condenser (based on refrigeration
pressure).
V43 valves are available for non-corrosive refrigerants
such as R-22, R-12, R-134A, R-404A, R-502, R-507,
etc. Specially designed V43 valves are also available
for ammonia service.
Commercial V43 valves are constructed with a cast
iron body and brass internal parts. The seat material is
bronze.
In order to resist the corrosive action of sea water, the
V43 maritime and navy models are constructed with a
red brass body, bronze and monel interior parts, and
monel seat material.
IMPORTANT:
All V43 water regulating valves
are designed for use only as
operating devices. Where valve
failure can result in personal
injury and/or loss of property, it is
the responsibility of the installer
to add devices (pressure relief or
safety shutoff valves) or systems
(alarm, supervisory) that protect
against or warn of device failure.
O
peration Description
The V43 valves are self-contained units, requiring only
the inlet and outlet water line connections and the head
pressure connection at the top of the bellows.
A built-in pilot valve, driven by refrigeration pressure,
operates the main valve with water.
The main valve seat disc assembly is suspended on a
heavy duty rubber diaphragm, eliminating all
closely-fitted and sliding parts. This reduces friction
within the valve, allows for more precise control, and
reduces the chances of the valve stem sticking (to an
O-Ring or other sealing components) in dirty water
conditions.
2 V43 Pressure Actuated Water Regulating Valve Product/Technical Bulletin
D
etermining Valve Size
To select the correct valve size, first complete
Steps 1 through 3. These steps will determine the
following variables:
•
Maximum Water Flow Required
•
Refrigerant Head Pressure Rise Above the
Valve Opening Point
•
Water Pressure Available (WPA)
As instructed in Step 4, use these three variables to
locate a point on one of the flow capacity charts
(Figure 4) which slightly exceeds the maximum water
flow required. The flow capacity chart containing this
point represents the proper valve size.
Step 1: Determine the Maximum Water
Flow Required.
Use the table provided by the manufacturer of the
condensing unit to determine the maximum water
flow required. If this information is not available,
calculate the maximum water flow required by
using the following formula:
Maximum Water
=
Flow Required
Outlet Temperature - Inlet Temperature
(GPM)
Note:
If the outlet water temperature is not
known, assume it to be 10F° below the
condensing temperature.
Example: If a 100 ton capacity system has an inlet
water temperature of 85°F and an outlet water
temperature of 95°F, the maximum water flow
required is:
Maximum Water
Flow Required
Maximum Water
Flow Required
Tons of Refrigeration x 30
100 x 30
=
95 - 85
=
300 GPM
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