Pressure-Reducing Valves
What a Pressure-Reducing Valve Does
Oil moving from the oil separator to the oil reservoir or oil level controls is at a higher discharge pressure. This pressure must be reduced to a pressure slightly higher than the compressor crankcase.

Selecting the Correct Valve
To maintain proper oil return, each of the oil system components must be selected according to the requirements of the overall oil control system.

High Pressure System
If your system has an oil separator with a built-in oil reservoir, you will need one of two models depending on your system; either an A-7, a constant-output valve, or an Y1236C, a variable-output valve.

	A-7 The A-7 is a constant output valve. The majority of Temprite 920R Series coalescent oil separators monitor the oil back to the oil level control via the A-7 pressure-reducing valve set to the desired pressure. NOTE: If you are using a split suction header, i.e., +20°F, -20°F, you will need two (2) A-7 valves per system. See schematic: High Pressure Oil System with Split Suction
	Y1236C The Y1236C valve is a variable output pressure-reducing valve that tracks suction pressure. It is designed for high-pressure oil return systems, or other situations where a differential pressure regulator is required. Set the output as needed for the system and the Y1236C adjusts the flow to maintain the desired output pressure. See schematics: High Pressure Oil System with Split Suction and High Pressure Oil System with Pressure-Reducing Valves
NOTE: A TraxOil electronic oil level control does not require a pressure-reducing valve. Low Pressure System If your system has an oil separator with an external reservoir, you will need the OCV-20.
	OCV-20 The Oil Differential Check Valve-20 (OCV-20) relieves pressure from the reservoir to the suction header to maintain a higher pressure in the reservoir at a pre-set level above the suction pressure. The pressure differential created by the OCV-20 ensures a constant oil flow from the reservoir to the oil level control. See schematic: Low Pressure Oil System

NOTE: The OCV-20 will only relieve pressure from the reservoir in excess of its fixed set point. Systems with fluctuating suction pressures as a result of compressor unloaders, staging or other suction line controls must be fitted with an pressure-reducing valve with a differential greater than the suction pressure fluctuation, such as the OCV-30. This ensures oil flow from the oil reservoir through the oil level control to the compressor crankcase.

Resource Documents:
Installation Instructions for A-7 Oil Pressure-Reducing Valve

Contact Temprite for:
Customer Support: Sheila Michalek
Technical Support: Fred Gerleve