CLASAR check valve standard version

DN200-500

Check valve Wafer version

Fluid velocity toward time

Pressure surge comparison

CLASAR check valve standard version

RANGE / MARK ®
CHECK VALVES and STRAINERS
CHECK VALVES and STRAINERS
PRODUCT FAMILY
PIPELINE PROTECTION
PIPELINE PROTECTION
Main features

Description

Closing time (dynamic response) is a fraction of a second, avoids pressure surges in the pipeline or minimizes them, suitable for high pressure applications (PN50 - 725 psi).

No risk of axial disc jamming as the CLASAR® does not have an axial shaft.

Short face to face, enabling easy installation, perfect disk sealing, excellent erosion resistance of axial disc (corrosion free axial disc material).

No maintenance required.

Suitable for a wide range of applications due to the available materials.

Material and coatings

Check valve Wafer version

Item

Designation

Quantity

Material

Coating

1a-1b

Body/Upstream body

1

Ductile iron GJS 400-15 according EN 1563

standard thickness 100μm liquid epoxy paint RAL5005

2a-2b

Backing plate / Downstream body

1

Ductile iron GJS 400-15 according EN 1563

standard thickness 100μm liquid epoxy paint RAL5005

3

Axial disc (1)

1

Polyurethane

4

Spring

1

Stainless steel

5

O-ring

1

E.P.D.M. according to EN 681-1

6

Tagplate

1

Stainless steel

(1) The choice of the axial disc material depends on the application parameters, please contact us.

Option : thickness epoxy paint 150 μm / thickness RILSAN 250μm (consult us)

Maximum working pressure

DN (mm)

80

100

125

150

20025030035040045050060070080090010001200140016001800

DN (inch)

3"

4"

5"

6"8"10"12"14"16"28"20"24"2832"36"40"48"56"64"72"

PMA (bar)

50

50

50

5050505050505050252525202016161616

PMA (psi)*

725

725

725

725725725725725725725725362362362290290240240240240

* at ambient temperature

Mounting between flanges

DN (mm)

80

100

125

150

20025030035040045050060070080090010001200140016001800

DN (inch)

3"

4"

5"

6"8"10"12"14"16"28"20"24"2832"36"40"48"56"64"72"

EN 1092-1

PN 6

DIN 2501

PN 10

Yes

Yes

Yes

YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYes
BS 4504PN 16YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYes
ISO 2084PN 25YesYesYesYesYesYesYesYesYesYesYesYesYesYes
ISO 7005PN 40YesYesYesYesYesYesYesYesYesYesYesYes
EN 1759Class 150YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYes
Class 300YesYesYesYesYesYesYesYesYesYesYesYes
ANSI B 16.5Class 150YesYesYesYesYesYesYesYesYesYesYesYesYesSee ANSI B16.47 A
Class 300YesYesYesYesYesYesYesYesYesYesYesYes
ANSI B16.47 AClass 150See ANSI B 16.5YesYesYesYes
MSS SP 44Class 150YesYesYesYesYesYesYesYesYesYes
AWWA C207Tables 2-3-4-5YesYesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes : Possible for every versions

Hydraulic characteristics

Description of high dynamic response check valve

The features of ideal check valve can be summarized in the graph bellow

  • t = 0 The pump stops
  • t = t0 The velocity of the water is V = 0. It is the beginning of the reverse flow. Usual values: 1/100 s < t0 < 1/10 s
  • T = t1 The obturator of the check valve is positioned on the seat The reverse velocity of the water is V1 The reverse flow is stopped immediately The overpressure is proportional to the reverse velocity (V1)
  • The ideal check valve should close at t = t0

Fluid velocity toward time

CLASAR® fulfils this requirement as this check valve has:

  • Short face to face, thus reducing the stroke of the axial disc
  • No axial shaft that may increase the closing time (risk of jamming)
  • Density of the axial disc material = 1 (no inertia of the axial disc in water, low weight of the axial disc)
  • Spring enhancing the closing time
  • No creation of shock at closing time due to metal/plastic contact

Pressure surge comparison with different check valves

The graph bellow shows the water hammer resulting from closure of various type of valves under identical operating conditions:

Single flap valve Dual plate check valve CLASAR®

Pressure surge comparison

Flow coefficients (Kv, Cv)

Kv is the flow in m3/h of water, at an average temperature of 20°C, crossing the valve creating a headloss of 1 bar.

DN (mm)

80

100

125

150

20025030035040045050060070080090010001200140016001800

DN (inch)

3"

4"

5"

6"8"10"12"14"16"28"20"24"2832"36"40"48"56"64"72"

Kv

171

266

417

60276211861704231230974003483069371309112170213781931938451525496863586861

(Cv = 1.16 Kv)

Headloss

∆P = headloss (bar) ; p = density (for water, p = 1) ; Q = flow (m3/h) ; Kv = flow coefficient (m3/h) ; 10 mWC = 1 bar = 100 kPa = 14.5 psi

Installation

Installation recommendation

Mounting instructions

As for most valves and fittings, sliding flanges or similar on the pipework are recommended to provide the clearances needed to insert and remove the valve and to prevent unacceptable stressing due to inevitable misalignment..

At least one of the pipes connected to the valve must be firmly bolted to withstand the thrust during valve closure.

Instructions before start up:

  • Before mounting, carefully check the valve for cleanliness. Remove possible pollutions and particles from the pipework and flush the system thoroughly with water or compressed air as appropriate. Important ! Particular care should be taken to remove pieces of welding rod chips liable to damage the axial disc and sealing surfaces.
  • Never weld the flanges to the pipe when the CLASAR® is in position because this might damage the axial disc.
  • Provide a trash rack or strainer that will prevent particles from interfering the valve's functionality.
  • Check that the flow takes place in the direction shown by the arrow on the valve
  • CLASAR® wafer type must be perfectly aligned with the pipe centerline. Use spacer tubes mounted on tie-rods if necessary.