Waukesha Cherry-Burrell
Installation
11/2012
95-03057
Page 15
Refrigeration Valves
Liquid Feed Solenoid Valve
Liquid Feed Solenoid Valve is for on/off control of liquid
refrigerant flow. Valve is closed when de-energized.
Dual Pressure Regulating Valve
Dual Pressure Regulating Valve is shipped loose for installation
in vapor line on discharge side of refrigeration piping. Valve
regulates high-pressure for internal relief and low-pressure with
on/off solenoid valve for process control. It can be furnished for
manual regulating, pneumatic control with clean, dry, and oil free
air from 0-60 psig, or with a 115 volt motor mounted on the
regulating pilot that responds to a 4-20 milliamp electrical signal.
When using air, a decrease in pressure will lower the inlet
pressure producing a lower temperature.
Sporlan Level Master Control (LMC) or Level
Switch
Gravity Systems with Accumulator are furnished with a Sporlan
Level Master Control (LMC) or a Level Switch.
The LMC is a thermostatic expansion valve with a 15-watt heater
element. As the level in the accumulator drops, the electrically
added heat increases the pressure within the thermostatic
element and opens the valve. As the liquid level rises, the
electrical input is balanced by the heat transfer from the bulb to
the liquid refrigerant and modulates or shuts off the liquid flow.
Minor adjustments in the level response can be made by
adjusting the spring tension of the expansion valve seat.
If a refrigerant level float switch is provided, single or double
depending upon specifications, it is used to control the
accumulator level by opening or closing a solenoid operated
refrigeration valve. These systems contain that valve and an
expansion valve with a flow indicating scale.
Refrigerant Return Valve
Some Horizontal Votators have a solenoid operated Refrigerant
Return Valve that is in the closed position when the solenoid is
de-energized. This valve is used to stop the cooling process and
is closed if hot gas is applied.
High capacity freon systems have two solenoid valves: one for
hot gas to activate the return valve, the other to bleed the gas to
the suction line.
Flow Control Valves
Liquid Overfeed (LOF) or Pumped Refrigeration Systems have a
manually adjusted Flow Control Valve with setting scale for
refrigerant flow to each Votator cylinder. This valve maintains a
constant flow of liquid to the Votator and can serve as a check
valve to prevent back flow of liquid during hot gas.
The indicator scale on the valve corresponds to the refrigeration
tonnage. The regulator is set by multiplying the tonnage load by
the desired re-circulation rate. For example, if the refrigeration
load is 10 tons and 200% (3:1) overfeed is desired, the valve
should be set at 30 on the scale reading.
