Stainless Steel Bonnet Bolts Lightweight Resilient Seated Gate
Valve
Resilient Seated Gate Valve 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.
Resilient seated gate valve to EN 1074-1 and 2 / EN 1171, with WRAS
approved EPDM
rubber parts.
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.
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.
Resilient Seated Gate Valve Specifications:
| NO | Part name | Material |
| 1 | Body | Ductile cast iron |
| 2 | Wedge | Ductile cast iron + EPDM |
| 3 | Stem nut | ZCuAl10Fe3 Gunmetal |
| 4 | Gasket | EPDM |
| 5 | Bonnet | Ductile cast iron |
| 6 | Gland gasket | ZCuAl10Fe3 Gunmetal |
| 7 | Stem | 2Cr13 S.S.x 20Cr13 |
| 8 | Gland | Ductile cast iron |
| 9 | Rubber wiper | EPDM/NBR |
| 10 | Hand wheel | Ductile cast iron |
Resilient Seated Gate Valve FEATURES
⊙ Shot-blasting
protective surface finished by shot-blasting and the surface is
smooth and neatness.
⊙ Flatting seat
Smooth continuous bore way without seating recess, it is not easy
to get impurity pilled up.
Making the liquid straightway.
⊙ Treating with rubber
Both inner and outer are coated with advanced knowledge of rubber
vulcanization then making
sure of the elasticity of rubber ,and make sure the exact geometry
dimension. Rubber and ductile
cast iron valve hand together hardly. This can avoid fall-off due
to long-term use.
⊙ Anti- corrosion
Both inner and outer are coated with non-toxic powder epoxy resin
to strengthen the capacity of Corrosion resisting and raise the
quality
of water supply.
⊙ Ruggedization
The older ductile iron valve is easy to rupture after being
impacted by nonego. It can stop
rupture depend on the good mechanics capability of ductile iron .
Applications : This valve widely applied in the liquid pipes for opening or
closing fixing in such
water, sewage disposal, electric power, energetics pipe , chemical,
shipping, energy sources etc.
