SAFETY RELIEF VALVE Type SRH1, SRH2, SRH3, SRH4, & SRH5 Suitable For: Ammonia, R22, R502, R404A, R717 and Other Common Refrigerants FEATURES • ANSI / ASHRAE 15 Complaint • Excellent Repeatability / Unaffected by Vibration • All Stainless Steel Internal Parts • PTFE Seat • Capacity Rating for Vapor Only • Pressure Settings 150 to 400 psi DESCRIPTION The Type SRH High Capacity Safety Relief Valves are designed and constructed to meet the requirements of Section VIII ASME Boiler and Pressure Vessel Code and ANSI/ASHRAE 15 Code requirements and bear the ASME Code Symbol (UV). Employing proven principles of design, these Safety Relief Valves are highly reliable and dependable. Precision machined moving parts of stainless steel, and a PTFE disc prevent sticking due to corrosion or cold welding and assure valve opening at the set pressure long after installation. They are not suitable for corrosive ambient atmospheres such as chlorine, etc. Installation, Service, and Parts Informtion APPLICATION The Type SRH1 thru SRH5 valves are for use with Ammonia and Halocarbon refrigerants in non-corrosive environments. Pressure settings and capacities apply only when the valve is discharging to atmospheric pressure. PRESSURE SETTINGS Codes require valve settings equal to or less than design working pressure of the vessel protected. The Type SRH Safety Relief Valves are available in six standard settings, from 150 psig to 400 psig in 50 lb. increments. Special settings between 150 psig to 400 psig in 25 lb. increments are also available. To retain the validity of the code symbols, pressure settings and capacity, these valves must be set and sealed at the factory. When required, valves can be returned to the factory for verification of setting, or readjustment to the original setting. No major repairs or reconditioning will be done. Contact factory for details. PURPOSE Safety Relief Valves should be used to protect each refrigeration system pressure vessel that can be isolated by-valves. In many localities state or municipal codes govern selection and installation of Relief Valves. Many are patterned after the ASME Boiler and Pressure Vessel Code and the ANSI/ASHRAE 15 Safety Code for Mechanical Refrigeration. Where no compulsory code exist, installation of Relief Valves according to this ANSI/ASHRAE Code is highly recommended. SELECTION DATA The Type SRH Safety Relief Valve is intended to prevent the pressure of the vessel from rising more than 10% above the Design Working Pressure (DWP) of the vessel or the pressure setting of the relief device, whichever is the lower pressure. Whenever conditions permit, it is advisable to have the relief valve pressure setting (which must not exceed the design working pressure of the vessel) at least 25% higher than the normal operating pressure for the refrigerant used. Pressure limiting devices, such as high pressure cut-outs on positive displacement compressor systems, must stop the action of the pressure imposing element at no higher than 90% of the pressure setting for the pressure relief device. Refrigerating Specialties Division 310205

CAPACITIES Valve Type Relief Valve Inlet Relief Valve Outlet Pressure Setting psig Fig. 2: SRH Dimensional Cross-Section DIMENSIONS IN INCHES Valve SRH1 SRH3 SRH3 SRH4 SRH5 WARRANTY All Refrigerating Specialties Products are warranted against defect in workmanship and materials for a period of one year from date of shipment from the factory, This warranty is in force only when products are properly installed, maintained and operated in use and service as specifically stated in Refrigerating Specialties Catalogs or Bulletins for normal refrigeration applications, unless otherwise approved in writing...