V43/V243 Series Pressure-Actuated Water-
Regulating Valves Product/Technical Bulletin
Introduction
The V43/V243 Pressure-Actuated Water-Regulating Valves
regulate water flow through the condenser of large
refrigerated cooling systems. These pilot-operated valves
open on an increase in refrigerant head pressure and
facilitate modulating operation.
The V43/V243 water-regulating valves are available for
commercial and maritime applications.
V43 valves are available for noncorrosive low- and
medium-pressure refrigerants such as R-134A, R-404A,
R-502, and R-507.
V243 valves are available for noncorrosive high-pressure
refrigerants such as R410A.
Commercial V43/V243 valves feature a cast-iron body,
brass internal parts, and bronze seat material.
To resist the corrosive action of sea water, the V43/V243
maritime and Navy models feature a red brass body,
bronze and MONEL
®
interior parts, and MONEL seat
material.
WARNING
Risk
This product is made of a copper alloy, which contains
lead. The product is therefore not to be used on
drinking water.
Figure 1: V43 Pressure-Actuated Valve
Features and benefits
Built-in pilot valve
Facilitates more precise throttling.
Easy adjustment
Facilitates service and adjustment without breaking line
connections.
Drain plug
Drains water during shutdown to reduce the possibility of
freeze-up.
Mesh MONEL screen
Protects the pilot valve from items such as dirt and scale.
You can remove the screen for cleaning and servicing
without breaking any line connections.
Application
Important:
All V43/V243 water-regulating valves are
designed for use only as operating devices. Where
valve failure can result in personal injury and loss
of property, it is the responsibility of the installer to
add and maintain devices (pressure relief or safety
shutoff) or systems (alarm or supervisory) that
protect against, or warn of, device failure.
Note:
The V43 and V243 Series Head Pressure
Regulating Valves are available for cooling
applications only (direct acting).
Operation
The V43/243 valves are refrigerant-actuated units that
require only system refrigerant head pressure to operate.
The valve does not require electrical power: if you make
the inlet and outlet water lines and refrigerant head
pressure connections, the valve functions.
Refrigerant head pressure drives a built-in pilot valve that
operates the main valve. Water and spring pressures are
the main valve's opening and closing forces.
The main valve seat disc assembly is suspended on a
heavy-duty rubber diaphragm, eliminating any close-
fitting or sliding parts. This reduces friction within the
valve, facilitating more reliable control. This also reduces
the chance of the valve stem sticking in dirty water
conditions.
LIT-125683 Part No. 24-7664-699 Rev. E
2021-08-17
V43, V243
