KINGNA TRADING

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Silent Check Valve (HC41X)

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

Check Valves

Swing, ball, silent and flapper check valves to stop reverse flow and water hammer.

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The silent check closes on a tuned 304 spring the moment forward flow stops, before the column has time to reverse — which is what makes it silent and what makes it the right valve at a pump discharge with a long main, where a swing check would let the column come back and slam. The price is pressure drop: the spring is always in the flow, and on a low-head duty that matters. It also wants reasonably clean water; grit in the guide is how these stick open. DN50–DN400, EPDM seat, epoxy ductile iron.

General Specifications

Size RangeDN50 – DN400
ModelHC41X
Pressure RatingPN10 / PN16 (PN25 on request)
End ConnectionDouble flanged
Flange DrillingBS EN 1092-2 (DIN 2501)
ClosingSpring assisted — silent, water-hammer proof
ServiceTall buildings, pump stations, HVAC
Max. Working Temperature70 °C standard (EPDM) — NBR for 80 °C, FKM for up to 150 °C on request

Materials & Coating

BodyDuctile iron, epoxy coated; duplex 2205 / 2507 available on request
SealEPDM
Spring304 stainless steel

Design Features

Why choose itCloses instantly on pump stop — no surge or banging

Applications

Tall buildings Water hammer protection Pump stations HVAC systems

More from this series

Silent Check Valve (HC41X) — Angled view showing the flanged opening and internal guide stemSilent Check Valve (HC41X) — Top-down view of the blue flanged opening and internal guide mechanismSilent Check Valve (HC41X) — Elevated view of the blue valve showing top flange and interior

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