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
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
stronger and more rugged than common cast iron, or
so called semi-steel (class B iron), valves. They are
more dirt resistant than full skirted- piston-design
valves. All regulators use energized Teflon dirt-wiping
piston seals which operate reliably, even under dry, oil-
free conditions. The screw-on control modules (pilots)
are easy to change and can be used on all valve sizes.
All valves incorporate Teflon seating and stainless
steel spring closing. Manual-opening stems are located
on top of valves, up and away from dirt and rust
particles to avoid thread jamming. Nonasbestos
gaskets are standard. These standard regulator valves
use the same flanges and spacing as R/S model A4A,
except 1¼" (32 mm). Special Hansen 1¼" 4-bolt
regulators are available from stock to exactly replace
R/S 1¼" A4A only.
SIZING
Proper regulator valve sizing is important for smooth
operation and long, trouble-free life of the valve.
Therefore, capacity of the regulator at both the
maximum and minimum flow and pressure drop should
be analyzed. Pressure regulators will operate
satisfactorily to approximately 15% of the maximum
capacity of valve based on the corresponding pressure
drop. In extreme cases, downsizing or two smaller
regulators in parallel are necessary. For pressure drops
exceeding 45 psi (3.1 bar), special construction may be
required. Contact the factory.
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.
ELECTRICAL
When the electric shut-off, wide-opening, or dual
feature is supplied, a Hansen low-wattage, molded
electrical coil is included. Standard coil voltages are
115V, 208/230V, or 24V at 50/60Hz. Other voltages
available. The coil properly operates between 85% and
110% of the rated voltage. Coils should only be
energized while on the pilot solenoid tube. Unless
otherwise specified, the standard coil with a ½" fitting
for conduit is supplied with valves.
A watertight solenoid coil with 18" (450 mm) long wire
pigtail leads and a steel frame housing with a ½"
conduit fitting is standard.
Optional DIN Plug Coils are for grounded cord
connections and include the necessary DIN plug socket
with gasket.
Coils with Junction Boxes are optional. Integral, steel
junction box for connection of the 18" (450 mm) long
wire pigtail leads.
Vibration-resistant, bright, long-life, neon pilot lights
are available. These pilot lights operate on primary
voltage; a special coil with secondary winding is not
necessary. Optional watertight pilot light assembly is
also available; see page 20.
