Visual Indicator DI Resilient Seated Gate Valve by Red Epoxy Powder Coating
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 protectsagainst galvanic corrosion.
An EPDM rubber manchette sealing acts as themain hydraulic seal to the flow.
B. Body/bonnet connection
The unique assembly of the valve body and bonnetensures a durable tightness:
A round rubber bonnet gasket fits into a recess inthe valve bonnet preventing it
from being blown outby pressure surges.
The stainless steel bonnet bolts are countersunk inthe valve bonnet, encircled
by the bonnet gasketand sealed with hot melt. Thus there is no risk ofcorrosion
as the bolts are not exposed to themedium or soil.
C. Wedge nut
The fixed, integral wedge nut reduces the number ofmovable valve parts thus
minimizing the risk ofcorrosion and malfunction. The wedge nut is made of
dezincification resistant brass with lubricating abilitiesproviding optimum compatibility
with the stainlesssteel stem.
D. Vulcanized wedge
The ductile iron core is fully vulcanized with drinkingwater approved EPDM rubber
No iron parts are exposed to the mediumand the excellent rubber vulcanization
preventscreeping corrosion underneath the rubber.
Guides inthe wedge and on the valve body ensure a uniformclosure regardless of
Safe operation isensured, as the guides prevent overloading of thestem.
The wedge has a large through bore and asthere are no hollows in the core, stagnant
water orimpurities cannot collect and cause contamination.
Spindles gaskets O-ring - DRY THREAD -replaceable under pressure.
Stainless steel spindle with rolled thread andbearing.
Total sufrace rubbered wedge with replaceablespindle nut.
Gate valve with full bore.
All parts are protected against corrosion.
Resilient seated gate valve to EN 1074-1 and 2 / EN 1171, with WRAS approved EPDM
Body and bonnet of GJS-500-7 (GGG-50). Wedge of ductile iron with fixed wedge nut,
fully vulcanized with EPDM rubber. Stem of stainless steel min. 13% Cr with rolled thread
and wedge stop ring.
Stem sealing with 4 O-rings in a nylon bearing, an EPDM rubbermanchette, and a NBR
wiper ring. EPDM bonnet gasket in a groove, countersunk bonnetbolts encircled by the
bonnet gasket and sealed with hot melt. Sockets fitted with \"Euro\"sealing rings of EPDM
Epoxy coating to DIN 30677-2 and GSK guidelines - internally and externally.
The valve gate or closure member is typically in the form of a wedge made of cast iron material
so as to be sufficiently rugged so as to be suitable for high pressure and high flow applications.
In a resilient seat gate valve, the outer surface of the valve wedge is coated with an elastomeric
material so as to offer a bubble-tight seal even at elevated operating pressures.
The valve wedge is operated by turning a threaded stem so as to advance or retract the valve
wedge within the waterway of the valve housing.
Upon valve closure, the resilient material on the edge forms a bubble-tight seal with the internal
surface of the valve body. Dirt or other contamination in the valve operating system can lead to
incomplete sealing of the wedge or other malfunction.
Another object of the present invention is to provide a resilient seat gate valve having an
improved wedge operator system which readily overcomes the deleterious effects of contamination introduced either during construction or entrained within product carried to the valve.
These and other objects of the present invention which will become apparent from studying the
appended description and drawings are provided in a valve arrangement, that comprises a valve
housing that defines a water passageway and a valve seat within the valve passageway.
A valve wedge disposed within the housing passageway moves along a direction of operation
between a closed position in contact with the valve seat to block flow of water through the valve
passageway and an open position allowing flow of water through the valve passageway.
A pair of spaced apart tracks are disposed within the valve housing on either side of the wedge
and extend along the direction of operation. A pair of opposed wings carried on the valve wedge,
travel in each track. A valve stem coupled to the valve wedge moves the valve wedge in opposite reciprocating directions between valve open and valve closed positions.
Rollers are carried on the wings for rolling engagement with the tracks and scraper blades are
carried on the wings adjacent the rollers to scrape contamination from the tracks.
The tracks may be provided with or without a liner. If a wing is provided without rollers because of