Constant Flow Regulators

These carefully designed and manufactured Constant Flow Regulators accurately control the flow rate from refrigerant liquid pumps. They modulate to maintain a pre-calibrated ideal constant flow of refrigerant independent of pressure changes.

A properly-selected flow regulator can minimize the tendency of a pump to operate in a high NPSH pump region of the pump curve and consequently cavitate, and thus possibly lose prime and cease pumping.

These Constant Flow Regulators are designed for refrigeration systems. While primarily intended to be installed at the outlet of refrigerant liquid pumps, these versatile regulators can be used to control flow to individual circuits of large evaporators in place of hand expansion valves or other balancing devices in liquid overfeed systems.

Liquid Refrigerant Pump

Hansen Liquid Refrigerant Pumps offer a simple, proven design which is quiet and compact. These pumps have no shaft seals to leak to atmosphere. The rotor of the direct drive motor is inside of a stainless steel “can” while the external electrical stator is surrounded by an additional pressure-tight housing to further ensure against any possible loss of fluid.

Lubrication and cooling is performed internally by the pumped refrigerant; no oil is required.

The Hansen Liquid Refrigerant Pump series includes small and medium-size CAM models, which feature multistage impeller construction, as well as the larger CNF models, which feature single impeller construction supplemented by an axial flow inducer stage.

Both models have low NPSH requirements. GPM range is 7 to 300 GPM and temperature range is -60°F to +194°F (-50°C to +90°C) and to -150°F (-101°C) with special construction.

VPIF Valve Position Indicator

The Valve Position Indicator, model VPIF, is a digital monitoring module for use with Sealed Motor Valves (SMV). The VPIF displays the valve position during normal (automatic) operation. It can also be used to locally open or close the valve. This is particularly helpful when servicing or recalibrating the valve is required.

The large LED readout displays the valve position (in percent). The VPIF contains an internal independent current source, which is switch selectable for 4 mA (close) and 20 mA (open). The VPIF can be mounted on or near the valve for ease of use and visibility. This provides better accessibility for technicians when valves are mounted high in the air or in obstructed areas.

The VPIF can be mounted up to 10 feet (3 meters) in any direction from the valve. VPIEC Extension Cables are available where more length is required.position.

Sealed Motor Valve

The patented Hansen Sealed Motor Valve is a unique industrial grade motor operated valve which eliminates the most common concern of other motor operated valves – valve stem seal leakage.

Butt Weld Shut-Off Valve

Hansen low pressure drop refrigerant shut-off valves are designed to be butt-welded directly to steel piping, thereby eliminating potential leaky flanges or threaded joints and simplifying installation. Cast steel bodies are lightweight, yet have substantial wall thickness to overcome corrosion potential.

The cast steel body is rigid, reducing the potential for seat leakage due to flexing of the valve body under abnormal conditions. The “heart” of Hansen shut-off valves is the patented no-leak seal-plus-stempacking design. This seal design is used exclusively on Hansen shut-off valves and virtually eliminates stem seal leakage.

Socket Weld Shut-Off Valve

The advanced design and materials of the Hansen Steel Body Socket Weld Refrigerant Valves make them stronger and far superior to other commonly available products. This is especially true in regard to leakage from seats, stems, bonnets, and piping connections.

Socket weld steel bodies permit these valves to be quickly and easily welded directly into piping without the inconvenience of pipe threading or using bulkier iron-flanged valves with socket weld steel flanges requiring bolts, nuts, and gaskets.

Compared to butt weld valves, the Hansen socket weld bodies allow quicker welding, easier pipe alignment, and cleaner pipe and valve interiors.

Threaded Shut-Off Valves

The advanced design and materials of Hansen threaded refrigerant shut-off valves make them far superior to commonly-available products, especially in regard to non-leakage of seats, stems, and bonnets. Anyone who has experienced the failure of a shut-off valve at a crucial time will take care to insist upon these highly-reliable valves.

Coils and Pilot Lights

All Hansen solenoid valves utilize a one-size encapsulated, watertight coil. These coils are strong and efficient, requiring only 16 watts of power. All common voltages and frequencies are available. Coils are designed to operate from 85% to 110% of rated voltage. Pilot light assemblies are also available. The pilot light assemblies require no additional wiring.

The standard coil connection is a ½” female straight pipe fitting (NPSM) for conduit, with two 18” long, insulated 18 AWG wire leads plus ground wire. Coils with a DIN plug or a Quick Disconnect plug are available where codes permit. All coils meet NEMA 3R (IP32) (rainproof) and NEMA 4 (splashproof) requirements. This sealed construction can withstand direct contact with splashing or hose-directed water, wind blown dust or rain, and remain undamaged by the formation of ice.

HS8A Solenoid Valve

This heavy-duty HS8A refrigeration solenoid valve is flanged, compact, and pilot-operated. It is now more dirt resistant, erosion resistant, and corrosion resistant than other similar refrigerant valves. A dirt controlling Teflon piston seal helps prevent sticking. The valve body has improved, erosion resistant flow passages.

A proprietary coating on the valve body gives unmatched corrosion protection. The HS8A is used to provide on-off control of refrigerant flow. When the coil is energized, a pressure difference across the piston opens the valve seat. When the coil is de-energized, a spring closes the main Teflon seat to stop all flow.

HS7 Solenoid Valve

This flanged, heavy duty, pilot-operated, industrial refrigeration solenoid valve controls the flow of refrigerant. When electrically energized, a slight pressure difference across the valve causes it to open wide; when de-energized, a spring promptly closes the main Teflon seat to stop all flow in the arrow direction on the valve body.

The advanced design is ideal as a standard, stock, ammonia liquid line solenoid valve. While primarily for ammonia, this valve is also suitable for R22, R134a, CO2 and other approved refrigerants. Most common use is to automatically stop liquid line feed to recirculating liquid overfeed evaporators, to float switch controlled accumulators, and to thermal expansion valves; it is also suitable for hot gas defrost, and evaporator suction. (Note: for gravity liquid drain or equalization applications use low pressure drop HCK2 gas-powered suction stop valve or HS9B gas-powered solenoid valve.)