Product Overview
The Emerson Type FRM-2 Cash Valve is engineered for precise control in cryogenic circuits, functioning as either a Back Pressure or Economizer valve. It is designed to open at a preset pressure, relieving inlet pressure to a lower discharge pressure or managing gas head pressure during system idle periods.
This valve is compact yet highly efficient, featuring a "floating ring" design for smooth and consistent pressure regulation. It is suitable for applications requiring accurate back pressure control in cryogenic environments.
Key Features and Specifications
- Service: Cryogenic liquids and gases.
- Materials: Brass body and spring chamber, stainless steel seat disk, seat ring, and pressure spring. Available with stainless steel body, spring chamber, and diaphragms.
- Temperature Range: -320°F to 150°F (-195°C to 65°C).
- Maximum Set Pressure: 600 psig (41.4 barg).
- Connections: NPTF threaded ends (1/4", 3/8", 1/2").
- Construction: Available in 2-way and 3-way configurations. All parts are commercially cleaned for cryogenic service.
Installation Guidance
Proper installation involves connecting the supply line to the inlet and the outlet to the bypass or final vaporizer line. Valves can be installed as angle or in-line valves. It is recommended to install the valve horizontally with the spring chamber upright. For ease of maintenance, manual shut-off valves upstream and downstream are advised. Ensure compatible sealant is used on pipe threads, avoiding overtightening.
Important Considerations:
- Proper valve sizing for service conditions is crucial.
- The diaphragm-operated valve is designed for continuous pressure control. A diaphragm stop is included to prevent over-extension. In case of diaphragm failure, the valve will close. A safety relief valve may be advisable for system protection.
Operation and Maintenance
Back pressure is adjusted via a screw on the spring chamber. Turning clockwise increases pressure; counter-clockwise decreases it. Lock nut tightening secures the setting.
Maintenance procedures are detailed for servicing components like the pressure spring, diaphragms, and seat disk. Caution is advised to shut off all pressure connections and relieve system pressure before servicing. Repair parts can be installed without removing the valve from the line.
