Extend Stem Anti - Corrosion Ruggedization Resilient Seated Gate Valve With Surface box

A. Stem sealing

Three independent stem seals offering triple safety:

•  A NBR wiper ring protects against dirt from outside.

•  A polyamid bearing with 4 NBR O-rings protects against galvanic corrosion.

• An EPDM rubber manchette sealing acts as the main hydraulic seal to the flow.

B. Body/bonnet connection

The unique assembly of the valve body and bonnet ensures a durable tightness:

•  A round rubber bonnet gasket fits into a recess in the valve bonnet preventing it

   from being blown out by pressure surges.

•  The stainless steel bonnet bolts are countersunk in the valve bonnet, encircled

    by the bonnet gasket and sealed with hot melt. Thus there is no risk of corrosion

    as the bolts are not exposed to the medium or soil.

C. Wedge nut

The fixed, integral wedge nut reduces the number of movable valve parts thus

minimizing the risk of corrosion and malfunction. The wedge nut is made of
dezincification resistant brass with lubricating abilities providing optimum compatibility

with the stainless steel stem.

D. Vulcanized wedge

The ductile iron core is fully vulcanized with drinking water approved EPDM rubber

internally and externally.

No iron parts are exposed to the medium and the excellent rubber vulcanization

prevents creeping corrosion underneath the rubber.

Guides in the wedge and on the valve body ensure a uniform closure regardless of

high pressure.

Safe operation is ensured, as the guides prevent overloading of the stem.

The wedge has a large through bore and as there are no hollows in the core, stagnant

water or impurities cannot collect and cause contamination.

Design features:
 

Spindle’s gaskets O-ring - “DRY THREAD” - replaceable under pressure.

Stainless steel spindle with rolled thread and bearing.

Total sufrace rubbered wedge with replaceable spindle nut.

Gate valve with full bore.

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