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OS&Y DI Resilient Seated Gate Valve With Rising Stem For Fire Fighting
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.
All parts are protected against corrosion.
PN10 PN16 Resilient Seated Gate Valve With Rising Stem For Energetics Pipe
