PRESSURE REGULATING VALVES - Type SPR & DPR
GENERAL DESCRIPTION• Type SPR … Di rec t operated, 2-way valves, designed for maintaining suitable compressor suction pressure in refrigeration or air conditioning units. Fitted in suction line after the evaporator to prevent compressor overload.• Type DPR … Fitted in by-pass line between compressor discharge and suction line in refrigeration or air conditioning units. (Quantity order only.)Senses excessive compressor discharge pressure and releases it through the bypass line to the low pressure side to protect the compressor from overloading.
Reduces frequency of cut-in and cut-out of high pressure switch to keep the compressor operating. A typical advantage is in the heating cycle of heat pump systems during spring or autumn, or at the time when filter is clogged with foreign materials.
SPECIFICATIONS (Type SPR), TYPE NUMBER SELECTION & DIMENSION
• Suction pressure regulating valve type SPR Suction pressure regulating valve is installed between compressor and evaporator in order to keep outlet pressure (suction pressure) under it's setting.
In case of rapid increase of load, suction pressure regulating valve could be used to prevent from overload of electric motor for compressor.
• Discharge pressure regulating valve type DPR Discharge pressure regulating valve is mounted in the lowpressure side bypass piping from the discharge piping of a compressor as a control valve to control the discharge pressure to be lower than the specified pressure for the purpose of preventing the compressor from being an abnormal high pressure.