Check Valves

Threaded Check Valves

A threaded check valve screws directly onto the pipe thread and allows the medium to pass in one direction only. When flow stops or reverses, the disc, spring or ball closes automatically and protects the line.

The group includes swing (hinged disc), spring, horizontal, vertical and ball types. Body options are brass, bronze, stainless steel, ductile iron and PVC-U.

1/4″–4″Thread size

PN16–PN25Common pressure classes

5Body materials

170 °CMax. temperature, bronze swing type

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Main Applications

Preventing backflow on pump discharge lines
Booster set and well pump outlets
Boiler feed water and condensate lines
Heating and ventilation circuits
Compressed air lines and compressor outlets
Ball types on waste water and drainage lines

Technical Data

Connection	Threaded (BSPT on bronze swing type)
Thread size	1/4″ – 4″ (product range)
Pressure class	PN16 / PN20 / PN25 (depending on model)
Closing element	Hinged disc, spring loaded disc or ball
Body material	Brass, bronze, stainless steel, ductile iron, PVC-U
Bronze swing body	CC491K bronze
Bronze swing temperature	−10 °C … +170 °C
Bronze swing sizes	1/2″ – 2″
Bronze swing length (L)	1/2″: 58 mm · 1″: 76 mm · 2″: 112 mm
Stainless spring body	AISI 304 (according to product names)
Medium	Water, condensate, steam, oily media, air (by type)
Installation	Per the flow arrow; horizontal lines recommended for swing type (depending on model)

Material Options

Part	PN20 · bronze (swing)	PN16 · stainless (spring)	PN16 · PVC-U (ball)
Body	Bronze CC491K	Stainless steel AISI 304	PVC-U
Cover	Bronze CC491K	Depending on model	Depending on model
Hinge / closing element	Brass CW617N	Depending on model	Ball (material depending on model)
Hinge pin	Stainless steel 2Cr13	—	—
Hinge stem	Stainless steel	—	—
Spring	—	Depending on model	—

The bronze swing column is from the spare parts list of the manufacturer datasheet. For the stainless spring and PVC-U ball types the body material is taken from product names; internal parts are confirmed with the product datasheet.

Advantages

Self Operating

Needs no power or control.
Closes the moment the flow direction changes.

Protects the Pump

Reverse flow is prevented from turning the pump backwards.
Holds pressure in the line on booster systems.

Wide Choice

Type and material are selected for the medium.
A ball type is chosen for waste water, a spring type for clean water.

Compact Installation

The threaded joint needs no flanges.
A 1/2″ bronze swing type is 58 mm long.

Construction and Design Features

On the swing type the disc turns around a hinge pin and seats under its own weight.
On the spring type the disc is pressed onto its seat by spring force.
On the ball type the ball is pushed onto the seating surface by reverse flow and closes the line.
An arrow on the body shows the flow direction.
On the bronze swing type body and cover are cast from the same bronze alloy.

Send us the thread size, medium and installation orientation; we will choose the right check valve type together.

How to Choose?

Define the mediumPrefer a spring type for clean water and air, a ball type for waste water with solids.
Set the orientationA spring type suits vertical lines, a swing type suits horizontal lines.
Check the temperatureChoose a bronze or stainless body on steam and condensate lines.
Match the pressure classChoose the PN class at the pump outlet allowing for closing surge.
Confirm the thread sizeSelect a check valve of the same size as the pipe thread to avoid reducers.