HA4A Pressure Regulator
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.
HA4AM
The HA4AM can be ordered “less motor,” which includes control module, cam, and motor-mounting bracket. A three port bonnet with blanking plugs is standard on the HA4AM (up to 4²/100 mm port) so that other pilots can be field installed if required.
The “M” feature can also be ordered with other valve combinations, most commonly the HA4ADM Dual Pressure Regulator with motorized pilot. All material Features for the HA4A modular pressure regulator apply to the HA4AM.
HOTV, HOTW Oil Temperature Valves
A 3-way mixing valve that operates with the use of an internal thermostatic element. As oil is circulated through the screw compressor, it picks up heat from the compressor. The hot oil is circulated past the thermostatic element inside the valve and it is also fed to a heat exchanger, which provides cold oil to the opposite side of the valve.
The thermostatic element modulates the flow of oil from the cold oil port and the hot oil port to maintain a temperature range ±10°F (±5.6°C) of the nominal temperature setting at the outlet.
Rupture Disc Assemblies, Gauges, and Pressure Switches
Hansen rupture disc assemblies (RDAs) are used to indicate which pressure-relief valve has discharged. A pressure-relief valve will re-seat after discharging. However, a rupture disc remains open after bursting. (A rupture disc is not a stand alone safety device.) An installed pressure gauge or switch (required by code) provides a visual or electronic indication that the rupture disc has burst.
Also, rupture disc assemblies provide a hermetic seal to help eliminate any possibility of minute losses of refrigerant via pressure-relief valve seat materials. Hansen rupture disc assemblies are designed with a double-weld construction. There are no gaskets to leak. The rupture disc inside the assembly is patented hermetically welded to the body and mechanically isolated from any pipe stress. A separate body weld seals the assembly. This design helps eliminate internal and external leaks and ensures that the disc will burst at its design pressure.
Pressure Relief Valves
Designed to provide emergency relief from excessive pressure in refrigerant-containing vessels, they are built in strict conformance with ASME Boiler and Pressure Vessel Code requirements for safety relief devices.
Each valve bears the ASME code symbol of certification (UV). Their capacities are rated by the National Board of Boiler and Pressure Vessel Inspectors. These tamper-resistant valves are accurately set and sealed by qualified technicians at the factory.
EZ-SRV Cartridge Relief Valve
Hansen EZ-SRV Cartridge Pressure Relief valves protect refrigeration pressure vessels and other refrigeration system components from excessive pressure. If an abnormally high pressure occurs, the cartridge pressure-relief valve will open to relieve the excess pressure, preventing potential damage to equipment and injury to personnel.
EZ-SRVTM valves are built in strict conformance with both ASME Boiler and Pressure Vessel Code requirements and ISO 4126—Safety Devices for Protection of Excessive Pressure. Each valve bears the ASME code symbol of certi cation (UV) and CE mark. Valve capacities are rated by the National Board of Boiler and Pressure Vessel Inspectors (NB).
HPT Pressure/Temperature Transducer
The Hansen Pressure/Temperature Transducer is designed to measure both temperature and pressure within a single connection. Electronics calculate superheat or sub-cooling for the specified refrigerant with a 4-20 mA Output.
Base model is suitable for ammonia. Also suitable for halocarbons, propane, and carbon dioxide with the appropriate refrigerant key. Standard model HPT is suitable for -35ºF to +150ºF (-37ºC to +65ºC). Low temperature model HPTL is suitable for -60ºF to +150ºF (-51ºC to +65ºC). Low temperature models have a longer insertion length.
PXV & PXVW Expansion Valves
The Hansen PXV and PXVW are pulse modulating liquid refrigerant expansion valves. The PXV uses a specially designed, high-cycle, long life, solenoid operator. A sophisticated 4-20 mA input signal is used to monitor the liquid flow to the system. Unlike traditional TXVs, the pulse design eliminates the need to maintain minimum pressure differential. Low and varying liquid feed pressures (head pressure) are compensated by the basic variable valve operation. It is suitable for use with ammonia and most common refrigerants.
The unique PXVW60 body has an integral 100 mesh (150 micron) strainer screen and features direct weld assembly, eliminating flange gasket leak potential. In addition, the PXVW valve has an adjustable, integral hand-expansion plug to regulate the flow from 15 to 60 nominal tons of ammonia. Consult the factory for PXVW halocarbon capacities.
PXVC Intelligent Controller
The PXVC Intelligent, single loop, PID controller is a stand-alone cabinet mounted electronic universal controller.
The controller can be configured for several different applications. The controller, with factory defaults, will give reasonably good control. If control difficulties occur during startup, it is recommended first to thoroughly check system and components for proper installation, operation, and sensor location before attempting to tune the PXVC controller.
Field alteration of the controller configuration is not recommended. Controller tuning of the P-I-D is performed in the “parameters” section and are the only parameters the user may need to optimize.
Pump Guardian Pump Controllers
The Pump Guardian is a fully integrated controller designed specifically for use with industrial refrigeration pumps. Intended to safeguard refrigerant liquid pumps and to alert plant operators to improper or harmful operating conditions as they occur.
It simplifies control circuit wiring, consolidates pump protecting devices, keeps the operator informed as to the pump status, and eliminates nuisance shutdowns. Unlike most pump controllers, it provides excess recycling (on/off) protection to prevent unnecessary pump damage due to a reoccurring system problem. Motor over-temperature monitoring and protection is built-in for pumps having integral motor thermistors.
The Pump Guardian has a computer compatible RS232 serial communications port which enables access to stored information regarding pump.