Sewer Pump Check Valve: Rolling Ball Type

The Rolling Ball Type Sewer Check Valve (also known as a Ball Check Valve for pressure drainage) is a specialized non-return valve engineered specifically for wastewater and sewage applications. It is the ideal discharge check valve for submersible sewage pumps, designed to handle high-viscosity fluids and suspended solids without clogging, which is a major drawback of general-purpose check valves.

The unique rolling ball mechanism and full-bore structure ensure reliable, maintenance-free operation in contaminated lines.

⚙️ Technical Specifications

Parameter	Specification Range	Note/Standard
Nominal Pressure	$\text{1.0} - \text{1.6}\,\text{MPa}$	$\approx \text{PN}10 - \text{PN}16$
Nominal Size ( $\text{DN}$ )	$\text{DN}50 - \text{DN}350$	Common range for sewage discharge lines.
Applicable Temperature	$0^\circ\text{C} - 80^\circ\text{C}$	Standard temperature range for municipal wastewater.
Applicable Media	Water, Weakly Corrosive Fluids, High-Viscosity Sewage & Suspended Solids	Specifically designed for dirty water.
Connection Standard	Flanged ( $\text{GB}/\text{T} 17241.6$ , $\text{GB}/\text{T} 9113$ )	Robust connection standard.
Testing Standard	$\text{GB}/\text{T} 13927$ , $\text{API}598$	Tested for sealing and pressure integrity.

🔩 Main Parts Material

Component Name	Material Options	Key Function
Body, Bonnet	Ductile Iron ( $\text{QT}$ ), Cast Steel	Provides strong, robust structure.
Ball (Disc)	Carbon Steel Core Encapsulated in Rubber (Rubber-Coated Ball)	The core sealing element; the rubber coating ensures a superior seal and minimizes wear.
Ball Guide/Slideway	Ductile Iron, Cast Steel (Integral with Body)	Guides the ball’s movement.

⭐ Key Design and Performance Advantages

1. Anti-Clogging & Solids Handling

Rolling Ball Mechanism: The valve uses a rubber-coated rolling ball as its disc. Under media pressure, the ball rolls along an integral slideway within the body to open the valve.
Suitable for Sewage: This unique rolling action, combined with the smooth rubber surface, makes the valve self-cleaning and highly suitable for high-viscosity industrial and domestic sewage containing suspended solids, preventing the clogging common with general-purpose check valves.

2. Superior Hydraulics and System Protection

Full-Channel Structure: The valve body features a full water flow passage with no internal guides or hinges obstructing the flow path.
Low Resistance: Provides large flow capacity and low resistance, with head loss up to $50\%$ less than conventional swing check valves.
Silent Closure: The cushioned closing action of the rubber ball ensures silent closing and does not produce water hammer, protecting pumps and pipelines.