Valves & Parts
Spherical Cast Iron Ball Check Valve (HQ44X-16)
HQ44X Spherical Check Valve designed for high flow and anti-blocking applications. Equipped with a rubber-covered rolling sphere to ensure single-directional quiet closure and complete backflow block.
Key Features
- Spheroidal nodular cast iron body provides superior tensile and impact strength
- Internal non-blocking full flow channel minimizes fluid friction losses
- EPDM encapsulated iron ball ensures reliable sealing and long service life
- Low start-up flow and completely silent non-slam closing
Technical Specifications
- Size Range
- DN50 - DN400 (2" to 16")
- Working Pressure
- 1.6 MPa (PN16)
- Body Material
- Nodular Cast Iron / Ductile Iron
- Seat/Ball Seal
- EPDM / NBR
- Testing Standard
- GB/T13927
Parts & Materials List
- Valve Body
- Nodular Cast Iron (QT450-10)
- Rolling Ball
- Cast Iron Core with fully vulcanized EPDM
- Sealing Ring
- EPDM / NBR Rubber
- Fastening Screws
- Carbon Steel / Stainless Steel
Applications
- Water supply & distribution
- Wastewater and sewage networks
- Industrial process pipelines
- HVAC systems
Quality & Testing
100% shell and seat pressure testing per GB/T13927 or EN 12266-1; epoxy resin coating tested for corrosion resistance.
Frequently Asked Questions
Why choose a spherical ball check valve over a swing check?
The HQ44X has a full-flow non-blocking channel and a rolling EPDM-covered sphere that seats quietly without slamming, giving lower head loss and less water hammer than flap or swing designs in high-flow pump discharge and water mains.
Will the HQ44X clog with dirty water or sewage?
It is designed for anti-blocking service: the rolling ball follows the flow path and the open channel does not trap debris, which is why it suits pump discharge, drainage and raw-water service as well as clean water.
What sizes and pressures are available for the HQ44X?
DN50 to DN400 (2 inch to 16 inch) at PN16, in nodular cast iron QT450-10 with EPDM/NBR ball and seat sealing, tested to GB/T 13927.
How does the HQ44X close quietly?
The low start-up flow and the rolling-sphere geometry let the ball settle onto the seat gradually as flow drops, producing a silent non-slam closure instead of the impact shock of a clapper hitting the seat.
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