Multiport Relief Valves are designed for safety and to dampen the pressure swings within deaerators, steam lines and associated components. The Multiport Relief Valve dash pot vapor action provides smooth relief of excess steam to the atmosphere and maintains limited deaerator operating pressure swings. It eliminates the need to restack trays, and provides protection to the trays, boiler feed pumps and other equipment. Built for long service life, many Newterra valves have been in service for fifty years and some for as long as eighty years.
Multiport Relief Valve Springs cannot be compressed solid nor can the valve be locked closed by external adjustment. When springs are compressed to a maximum point by handwheel adjustment, the valve discs will open upon overpressure. Operating components are internal to the valve, which precludes tampering.
Designed for maximum safety. The valve and springs are designed for the maximum initial relief pressure indicated on the nameplate. This pressure cannot be exceeded by external adjustment even though the valve is fully adjustable to all pressures within the zero to maximum pressure.
Installation should follow every pressure-reducing station on all low-pressure exhaust steam systems using supplementary reduced live steam. This will provide absolute protection should the reducing valve fail in the open position.
Multiport Relief Valves are provided with multiple resilient surfaced vapor cushion discs (on standard brass trim valves) which are non-popping, cushion lift, cushion closed and tight reseating. The seating surface, an extremely resilient high-temperature thermoplastic material, allows movement yet helps provide a reliable “soft seal” that prevents leaking. Since this piston seat and disc assembly seats without leaking and reseats faster than other types of assemblies, useful steam is never wasted. The net result is a reduction of operating costs by saving steam.
- Controlled steam atmosphere
- Easy set pressure adjustment
- Alloy Steel springs for high temperatures and Chrome Vanadium Steel springs for medium and low temperatures
- The body is cast iron for applications to 500 ºF and cast steel for 600 ºF applications
- Discs are vapor cushion gradual lift non-pop type with replaceable resilient seating surfaces
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