8022A Henry Three Way Dual Shut-Off Valve, 3/4" FPT X 3/4" FPT **Discontinued - Replaced by 8022TH**

Henry 8022A Three-Way Dual Shut-Off Valve, 3/4" FPT X 3/4" FPT

The function of a three-way valve is to permit the replacement of one of the pressure relief devices while the other is protecting the pressure vessel. In this way, a vessel is protected from over-pressure during servicing.

It also allows a pressure relief device to be replaced in-situ, without removing the system refrigerant charge.

Applications

All three-way valves are suitable for HCFC and HFC refrigerants along with their associated oils. The 802 series is also suitable for ammonia.

Refrigeration standard, EN378, specifies that a three-way valve is required on vessels of a certain size. EN378, or an equivalent National Standard, should be consulted for further guidance. It should be recognised however that a three-way valve can be fitted to a vessel
of any size, to enable safe, easy and economical replacement of pressure relief devices.

Main features

• Proven robust design
• Compact

Technical Specification

• Allowable operating pressure = 0 to 31 barg (802 series)
• Allowable operating temperature = -29°C to +149°C

Materials of Construction

The 802 series valve bodies are made from brass and carbon steel respectively. The stem is made from plated steel. The stem seal packing is made from either PTFE or graphite-based material. The seal cap is made from molded plastic.

Installation – Main issues

1. Assemble the three-way valve to a vessel using a high strength pipe nipple.
2. The pipework must not impose loads on the valve. Loads can occur due to misalignment, thermal expansion, discharge gas thrust, etc