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Bulletin R429d MAR 2002

Specifications, Applications, Service Instructions & Parts

HA4A MODULAR PRESSURE REGULATORS ¾" THROUGH 6" PORT (20 MM THROUGH 150 MM)

Various Connection Styles and Sizes for Refrigerants

KEY FEATURES

HA4AB Regulator With Electric Wide Opening

INTRODUCTION
These advanced-design, strong-bodied, precisionmanufactured MODULAR regulators are superior in theirability to overcome dirt and sticky oil during opening and tight closing. Models are available for nearly every control function requirement of industrial ammonia and commercial halocarbon refrigeration. These regulators are ideal for cold storage plants, poultry plants, meat packing, fish processing, freezers, ice plants, breweries, bottling plants, heat recovery units, petrochemical plants,pharmaceutical plants, supermarkets, and many others.

ADDITIONAL FEATURES
Tolerant of Dry Systems For Ammonia, R22, R134a and other HansenApproved Refrigerants Wide Range of Options Inlet, Outlet, or Differential Pressure Wide Pressure Ranges Electric Shut-Off, Dual, or Wide-Opening Available Safe Working Pressure: 400 psig (27 bar) CSA Certified, CRN for Canada Contents Regulator VariationsCapacities Control Modules (Pilots) Main Regulators Only (AR1, AR3) Operation and Adjustment Installation Dimensions Parts List Service and Maintenance, Abbreviations Ordering Information, Conversions Page 3 4–5 6 7 8–11 12–13 14–18 19 20

APPLICATIONS
Evaporator Pressure Control Defrost Pressure Control Condensing Pressure Regulation Receiver Pressure Control Hot Gas Bypass Capacity RegulationSuction Pressure Control Air or Liquid Temperature Regulation Internal System Pressure Relief

MATERIAL SPECIFICATIONS
Body: ¾" through 4": Ductile iron, ASTM A536 5" & 6": Cast steel, ASTM A352 LCB Adapter: Ductile iron, ASTM A536 Piston: Steel, disc type, Teflon piston seal V-Port/Seat: ductile iron, with Teflon seat Main Seat: ¾" through 1¼": integral ductile iron 1½" through 6": stainlesssteel, removable Gaskets: Nonasbestos, graphite composite Manual Opening Stem: Steel, plated Pilots: Stainless steel trim Pilot Orifice: Stainless steel Flanges: Forged steel, ASTM A105 Safe Working Pressure: 400 psig (27 bar) Operating Temperature: –60F to +240F (–50°C to +115°C), lower temperatures possible at pressure downratings

The system should be free of dirt, weld slag, and rust particles.Regulators can be equipped with separate, close-coupled inlet strainers. No small, hidden, internal screens are used. Gauges and gauge valves should be installed on the inlet and outlet to help in system diagnosis. Because of the many regulator pilot combinations, during installation of a large job, the regulator nameplates should be checked against piping drawings to guarantee proper functionfor each location. Where pilot solenoid control modules are used, the nameplate coil voltage should be checked before wiring. Pipe sizing, anchoring, valve rating, system design, and other precautionary factors should be taken into consideration to ensure “liquid hammer” will not occur when the valve opens or closes. The 5" and 6" valves are type HA4W with integral butt weld end only. Thesesteel-bodied regulators are directly welded into the pipe line. During welding, the manual-opening stem should be opened downward several turns to protect the Teflon seat from weld heat. Welds should be annealed as necessary in accordance with good practice. Painting of valves and welds is recommended for corrosion protection. Pipe covering, where applied, should have proper moisture barrier. Beforeputting valves into service, all pipe connections, valve seats, cover seals, and stem seals should be tested for leaks at pressure levels called for in appropriate codes.

ADVANTAGES
These valves combine modern design and new age materials with advanced manufacturing techniques and intense quality control to offer a significantly superior and reliable product. Their ductile iron bodies are...
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