Emsal Vana
Products / Check valves · 001–029 / Wafer check valve
PRODUCT GROUP 001 · CHECK VALVE

Wafer check valve

A compact single-disc check valve that lets liquid or gas flow in one direction only and prevents backflow. When the flow stops, the disc closes by spring force or by the reverse flow; the valve is mounted directly between two flanges.

WAFER CHECK VALVETYPE 001 · EMSAL VANA
DN
25 – 1000
PN
6 – 25
BODY
ST-37
DISC
Rg5
STANDARD
DIN·JIS·ANSI
CONNECTION
EN 1092-1/B
TEST
EN 12266-1
DOCUMENT
EN 10204 3.1
FLOW DIRECTION
Valve selection guide →
Not listed? Send us your drawing for a custom size or material →
Drag to rotate · DN80 sample model (provisional)
Wafer check valve, selected material combination
BODY / DISC — carried over to the data plate and the quotation
CFD flow simulation · velocity field
Wafer check valve technical drawing: front view and section A-A; dimension letters D, K, L
DN80 example · dimensions (D, K, L) in the datasheet tableOpen datasheet · dimension table

Technical data

01
Nominal sizeDN25 – DN1000 · custom sizes available
Pressure ratingPN6 – PN25 · Class 150
Service temperature
NBR −30 °C … +100 °CEPDM −50 °C … +150 °CFKM −20 °C … +200 °CSilicone (VMQ) −55 °C … +200 °CPTFE −196 °C … +260 °CMetal −196 °C … +538 °C
Depends on the seal option; may be narrower depending on body and trim material. Exact value in the quotation.
StandardDIN · JIS · ANSI
Connection EN 1092-1/BEN 1092-1Flanges and their joints — circular flanges, PN designated · Part 1: steel flanges DIN 2501DIN 2501Flanges — connection dimensions (former DIN series)
TestTS EN 12266-1TS EN 12266-1Industrial valves — testing of valves · Part 1: pressure tests
OperationSpring-loaded or free (gravity-acting) disc
SealEPDM · NBR · FKM (Viton) · Silicone · PTFE

The standards listed apply to stocked products. Contact us for other standards.

Material

02

A wide range of materials sets the wafer check valve apart from Emsal's other check valves. Materials not listed can be supplied as custom manufacturing.

Body
SS316SS316LSS316TiSS304TiSuper duplex 1.4410Duplex 1.4462CuSn10Al-bronzeRg5Rg10ST-37GG25GGG40.3ASTM A216 WCBABSPTFE
Disc
SS316SS304TiSuper duplex 1.4410Duplex 1.4462Al-bronzeRg5Rg101040ABSPTFE
Lock, bolts
SS316SS304
Seal
NBREPDMViton (FKM)SiliconePTFE (virgin, carbon-filled)Metal
Coating
for Fe-C materials
Cataphoretic coatingGalvanizingZincNickelElectrostatic powder coatingAnti-corrosion primerWRAS-approved epoxy

Pressure drop

03
Water, 20 °C · Δp = (Q / Kv)² · click a curve to select the size
Pressure drop
—
Kv
—
Min. cracking pressure · horizontal, without spring
—

The cracking pressure is calculated by Emsal for a horizontal line and a disc without spring. At least 0.3 bar back pressure is required for tight shut-off.

Features

04

Design

  • Opens in the flow direction; closes against back pressure by spring or by its own weight
  • Mounted directly between flanges
  • Small size, low weight

Advantages

  • Takes up little space
  • Low pressure drop
  • Fast closing — reduced risk of water hammer
  • Easy installation, low maintenance

Applications

  • HVAC and water treatment
  • Process lines, pump discharges
  • Chemical and petrochemical
  • Fire fighting
  • Energy, marine

Considerations

  • Size matched to flange type and diameter
  • Spring-loaded type in horizontal lines
  • Seal suited to the medium
  • Install according to the flow direction

Position in the line

05 · P&ID
P-201 CV-201 V-201 TYPICAL PUMP DISCHARGE

The check valve is usually installed at the pump discharge, upstream of the isolation valve: when the pump stops, it prevents the line from draining back and the pump from running in reverse.

See it in the process line on the home page →
Wafer check valve bodies lined up in the workshop
FROM OUR FACTORYDN25 to DN1000, made in Türkiye.The wafer check valve is one of Emsal's in-house products · photo: Emsal factory

Accessories

06

O-ring on the body

With the O-ring fitted on the body, the valve can be installed in the line without a separate gasket.

Disc support spring

Keeps the disc closed in horizontal or inclined installations and when there is no flow; it can be designed to open at a specific pressure.

Downloads

07
DatasheetPDF · TR/EN · dimension table, parts list
Open datasheet
CAD modelSTEP · DXF · body + disc, simplified
Download STEP Download DXFBy downloading you accept the CAD terms of use.
3.1 certificate samplePDF · EN 10204 · TR/EN
Open sample

Related products

08
PRODUCT GROUP 002

Disc check valve →
PRODUCT GROUP 003

Dual plate check valve →
PRODUCT GROUP 004

Tilting disc check valve →
Wafer check valve · 001 · ST-37 / Rg5 · DN25–DN1000 · PN6–PN25