KINGNA TRADING

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Self-Operated Pressure Reducing Valve (ZZY)

Industrial valves and fittings dispatch fast — wear parts and complete machines quoted on request.

Steam System Valves

Valves for steam systems rather than for water: thermodynamic steam traps and self-operated pressure reducing valves that work without electricity or compressed air. Images are representative renderings of each series; finish, accessories and nameplate follow the confirmed drawing.

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A self-operated regulator uses the downstream pressure itself to move the plug: no actuator, no 4–20 mA signal, no instrument air. That makes it the right choice for steam mains, heat exchangers and plant air where a power failure must not leave the pressure uncontrolled. The spring sets the outlet pressure, the pilot or direct-acting diaphragm does the rest. Steam, water and air duty, DN15 to DN300.

General Specifications

Size RangeDN15 – DN300
Pressure RatingPN16 / PN40
OperationSelf-operated — spring set, no electricity or air
End ConnectionFlanged or threaded
MediaSteam, water, air, non-corrosive gases
Max. Working Temperature350 °C (steam)
Outlet SettingAdjustable by spring; pilot-operated version for high differential

Materials & Coating

BodyCast iron, ductile iron or cast steel
TrimStainless steel plug and seat
DiaphragmReinforced rubber or stainless on request
SpringSpring steel, painted

Applications

Steam mains Heat exchangers Plant air District heating

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Self-Operated Pressure Reducing Valve (ZZY) — 1

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