Knife Gate Valve DN50-400

Transversal gasket

Peripheral gasket

Flushing points

Knife Gate Valve DN50-400

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Main features

The knife gate valve is an ON-OFF gate valve for mudded waters. Its bevelled rectangular shovel, sliding inside a body with a circular outlet as well as its tightness system WEY® in the two flow directions, fit particularly well the transport of mudded fluids.

This valve is used for raw wastewaters, mud, water with sediments, in sewage works and sewage pipes under pressure.

Sure and indestructible

  • Sure: usable for any function thanks to their total sealing in the two flow directions under pressure and without pressure.
  • Reliable: service without disturbance thanks to their self-cleaning power, integral way, fluids engineering developed with an optimized geometry of the plates.
  • Decrease of prices: thanks to their system of sealing, the costs of maintenance are low, because it is not necessary to dismantle the valve since tightness can be restored under pressure.
  • Special request: solutions in case of difficult technical requirements.
  • Conformity: security in the installations in conformity with the curves of pressure.

Range

The knife gate valve is available from DN50 to DN1200 for a setting between flanges.

DNPFADrilling template
mmbar
50-15010ISO PN 10-16
20010ISO PN 10
250-3006ISO PN 10
350-4004ISO PN 10

For the other diameters refer to

RASRV28VAG800

and

RASRV28VAG900

Motorized version

Dimensional particularity for installation

The bolt holes ref. B are threaded.

The length of the bolts (B) must be adapted to the maximum screw depth on the valve, so that the gate is not blocked.

The bolts C pass outside the valve body.

DNValve assemblyNb of bolts + nuts per valves (case C)
Nb of screwed bolt holes (case B)Nb of bolts per valve (case B)Maximum screw depthThreaded
504817M16
654817M16
804817M164
1004820M164
1254822M164
1504821M204
2004823M204
25061219M206
30061223M206
35081620M208
40061228M2410

Material and coating

Item

Designation

Material

Coating

1

Hand wheel

Epoxy power average thickness 75µm, grey colour

1b

Actuator Auma

Epoxy power average thickness 75µm, grey colour

2

Superior stand

Sheet steel

Epoxy power average thickness 75µm, grey colour

3

Body

Ductile Iron EN GJL 1040

Epoxy power average thickness 175µm, grey colour

4

Screw

Steel Type Z13CF17

5

Operating nut

Bronze

6

Transversal Gasket

Nitrile

7

Gate

Steel Type Z7CN18.09

8

Hemispherical Joint

Nitrile

Specificity

Transversal gasket

  • The transversal gasket is placed on both sides of the gate. This replaceable device prevents leakage along the gate, grants the valve a longer life.

Peripheral gasket

  • The peripheral gasket is O’ring type. It guarantees a smooth track for the gate and assuring the body and gate tightness.
  • The gate has a bevelled profile.

Flushing points

  • The shape of the body presents flushing points on the closing zone, producing a self cleaning effect and preventing the accumulation of fragments.
  • The full bore passage allows the use of all the pipe cleaning technics and provides minimal headloss.

Conformity to Standards

Dimensional

  • distance between flanges: - ISO 5752 - NF E 29305-1 - DIN 3202
  • drilling template of flanges: - ISO 7005 PN 10-16 - NF E 29206 - DIN 2532

Operating stem under frame, according to the regulation on personnel security.

Functional

  • tightness test on every valve to1.1 PFA according to: - ISO 5208 - NF E 29311 - DIN 3230 Part 3

Marking

A marking of foundry is present on the body. The indication PN10 or PN16 refers to the drilling template whereas PB 4 or PB 6 corresponds to PFA 4 or 6 bars.

An identification plate PAM S.A. indicates the type, the serial number, the DN as well as the PN.

Accessories

The gate valve can be equipped with a contactor that stops the flow.

Setting, servicing, maintenance

  • Assembly direction: place the bevelled part of the gate upstream.
  • The knife valve is integrated between flanges. Provide the self-restrained dismantling joint type PF and flange gaskets. Note: for the setting, see absolutely that screws respect the maximum screwing depth so as they do not block the gate.
  • During the use, it is possible to compress the superior transversal gasket thanks to side screws.