Check Valves

Flanged Check Valves

A flanged check valve is a backflow valve installed between two flanges or with its own flanges that automatically shuts off reverse flow. It is used on high flow pump lines, steam and condensate circuits and process lines.

The group includes disc (wafer) and wafer swing types clamped between flanges, swing and lift types with their own flanges, and dual plate check valves. Products are available from DN15 to DN600.

DN15–DN600Bore range

PN16–PN63Pressure classes

300 °CMax. temperature, stainless disc type

40 barMax. pressure, stainless disc type

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Main Applications

Main backflow protection on pump discharge lines
Steam, condensate and boiler feed water lines
Heating and ventilation pipelines
Process lines in the mineral, oil and chemical industries
Shipbuilding and seawater circuits
Water lines in the paper and textile industries

Technical Data

Connection	Between flanges (wafer) or flanged body
Bore range	DN15 – DN600 (by type)
Pressure class	PN16 / PN25 / PN40 / PN63 (depending on model)
Body material	Cast iron, ductile iron, cast steel, brass, stainless steel
Stainless disc body	AISI 304 or AISI 316
Stainless disc spring	AISI 302
Stainless disc pressure	40 bar (100 °C) · 38 bar (200 °C) · 37 bar (300 °C)
Stainless disc temperature	−10 °C … +300 °C
O-ring options	EPDM −50…+150 °C · FKM −25…+200 °C
Fits between	DIN 2501 PN6/10/16/40, BS 10, ANSI B16.1 Class 125
Stainless disc length (L)	DN125: 90 mm · DN150: 106 mm · DN200: 142 mm
Installation	Any position (disc type)

Material Options

Part	PN16 · brass (disc)	PN40 · AISI 304 (disc)	PN40 · AISI 316 (disc)
Body	Brass (alloy code depending on model)	Stainless steel AISI 304	Stainless steel AISI 316
Disc	Depending on model (AISI 316 disc option)	Stainless steel AISI 304	Stainless steel AISI 316
Spring	Depending on model	Stainless steel AISI 302	Stainless steel AISI 302
Centring piece	Depending on model	Stainless steel AISI 304	Stainless steel AISI 316
Circlip retainer	Depending on model	Stainless steel AISI 304	Stainless steel AISI 316
O-ring	Depending on model	EPDM (FKM optional)	EPDM (FKM optional)

The stainless columns are taken from the manufacturer datasheet of a wafer disc check valve. The AISI 316 disc option on the brass disc type comes from product names; materials of swing, lift and dual plate types vary by model.

Advantages

Short Installation Length

The disc type is clamped between two flanges.
It takes far less space than a classic swing type.

Any Position

The spring loaded disc type works on vertical and horizontal lines.
When flow stops the spring pushes the disc back onto its seat.

High Temperature

The stainless disc type is used up to 300 °C.
Used on steam and oil lines depending on the seal selected.

Choice of Types

Dual plate and swing types are offered on large bores.
The type is selected by installation length and flow conditions.

Construction and Design Features

On the disc type the disc moves axially on a centring piece.
The spring pushes the disc onto its seat; the disc opens when flow pressure overcomes the spring force.
Disc and spring are held in the body by a circlip retainer and circlip.
The O-ring material is selected as EPDM or FKM according to the medium.
On the swing type the disc pivots on a hinge; on the lift type it rises on a vertical axis.

Send us the DN, PN, flange standard, medium and installation orientation; we will define the right check valve type and sealing material.

How to Choose?

Define the typeChoose the disc type for tight spaces and any position; consider swing, lift or dual plate types where a flanged body is wanted.
Match the flange standardCheck the DIN, BS or ANSI standard and PN class of the mating flange.
Compare temperature and pressureCheck the operating point against the pressure-temperature values in the datasheet.
Select the sealChoose an EPDM O-ring for water, condensate and steam, FKM for oil, gas and air.
Confirm orientationUse a spring type on vertical upward flow; check the manufacturer installation orientation for swing types.