A81B-10series Parker - Refrigerating Specialties A81B Inlet Pressure Regulator with Electric Bypass

These ductile iron-bodied regulators, with brazed copper couplings, will modulate the flow of refrigerant vapor or liquid to maintain a constant pressure at a control point regardless of fluctuations in load or ambient conditions, or alternate diversions for flow. Models are available in combinations of connection sizes, port sizes, functions and features as designated by the model code, for application in a wide variety of control functions on industrial, commercial and air conditioning systems. (3) control functions are available: Inlet, Outlet and Differential pressure control. (2) control features can be added by incorporating pilot solenoids; either Electric Shut-off (S) or Electric Bypass (also called Wide-Opening) (B).
The valves are an integrated assembly of (4) modules: 1) A body, which contains no moving parts, but is ordered to suit a particular connection size; 2) A capacity cartridge, which contains both piston and modulating plug, and defines the Port Size; 3) A pilot adapter, which defines the valve function and onto which the Pilot Solenoids providing either the "S" or "B" feature are added as required; 4) The bonnet, containing the Range Spring and adjustment screw, which mechanisms are set for the value of pressure which the valve is to maintain.
This unique modular design allows the regulator to be soldered into the line without disassembly, yet provides full access for disassembly, cleaning and servicing from the top only. Interchangeable capacity cartridges facilitate flow revisions should an undersized or oversized condition be created, while pilot adaptors can be changed out to add features or even change functions. Thus, retrofitting for additional evaporator capacity, heat reclaim, or holdback for hot gas defrost is simple and requires no pipe line revisions under most circumstances.
All A8 series regulators for inlet and outlet functions feature the wide range pressure setting, 250mm Hg to 27.6 bar (10" VA. to 400 psig). Regulators for differential function have a range of 0 to 8.3 bar (0 to 120 psi).

Features:

• Dual spring for wide range pressure set-points
• Pilot operated for close control at desired set-point
• Excellent regulation at light loads
• Interchangeable capacity cartridges
• Inlet, outlet or differential regulator functions
• Low pressure drop
• Few moving parts
• Long-life stainless steel diaphragms (no bellows to fail)
• Variations available for pilot electric shut-off and pilot electric wide-opening pressure control
• Manual opening feature
• All service from the top
• Sweat-in-place without disassembly
• Furnished with access fitting
• UL listed (except 50 Hertz versions)

Specifications:

• Design pressure (PS): 31.0 bar (450 psig)
• Range: 250mm hg to 27.6 bar (10" hg to 400 psig)