INSTRUCTIONS R429d
Dec 2003
HA4A MODULAR
PRESSURE REGULATORS
¾" THROUGH 6" PORT
(20 MM THROUGH 150 MM)
Specifications, Applications,
Service Instructions & Parts
Various Connection
Styles and Sizes
for Refrigerants
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": stainless steel, 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
INTRODUCTION
These advanced-design, strong-bodied, precision-
manufactured MODULAR regulators are superior in
their ability 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.
APPLICATIONS
Evaporator Pressure Control
Defrost Pressure Control
Condensing Pressure Regulation
Receiver Pressure Control
Hot Gas Bypass Capacity Regulation
Suction Pressure Control
Air or Liquid Temperature Regulation
Internal System Pressure Relief
ADDITIONAL FEATURES
Tolerant of Dry Systems
For Ammonia, R22, R134a and other Hansen-Approved
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
INSTALLATION
Regulators should be protected from dirt and moisture
during storage. The arrow on the body should be in the
normal direction of refrigerant flow. These valves will
not prevent reverse flow; use check valves where
necessary. Regulators are normally in horizontal pipe
lines with pilots and manual-opening stems on top. Do
not rotate the position of the valve adapter or the valve
will not operate.
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 function for 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. These steel-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.
Before putting 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.
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