GATE VALVES
The gate valve is the most widespread type of industrial pipeline
valve. Its application area is very wide. There are different types
of designs available depending on the construction of the closure
elements. Recommended for on-off service, without throttling, for
infrequent use, with minimal resistance to the flow.
For flow control, consult for a specially adapted design for this
purpose.
Available designs: Solid Wedge, Flexible Wedge, Divided Wedge and
Double Wedge.
Available materials: Cast steel, Forged steel, Stainless steel,
Nickel alloys and Others.
Sizes from DN 50 (2”) up to DN 1200 (48”).
Pressure classes from PN16 (Class 150#) up to PN250 (Class 1500#).
Maximum temperature up to 595°C.
Connection types: Flanged, Welded, Others .
*For more information please download the technical description or
ask for the full catalogue of the product.
lass 150
Class 300
Class 600
Class 900
Class 1500
Standard Construction Features:
Body: Flow areas are specifically designed for minimum turbulence
and pressure drop.
Bonnet Ample stuffing box area, Stellite® stem guide surface and
back seat shoulder for accurate guiding of the stem and back seat.
Ball Bearing-type Yoke Sleeve Large, high-pressure valves can
require a tremendous amount of torque to open and close. By
utilizing ball bearings in the yoke sleeve the operating torques of
these difficult-to-operate valves are reduced by as much as 50
percent.
Flexible Wedge Sealing Design: The flexible wedge is a one-piece,
fully guided cast wedge with a central hub to allow the seating
faces to move relative to each other, thus compensating for
distortion of the body seats due to thermal expansion or piping
loads. Seat ring and wedge seating face are set at a 9˚ angle from
vertical to minimize sliding con- tact of the wedge and seat ring
during opening and closing. Wedging actions help effect a tight
seal in low differential pres- sure services. Flexible wedge
construction resists wedge sticking or binding in services where
the valve may be closed when cold and opened when hot. Seating
surfaces are hardfaced with Stellite®6 to provide high cycle
capability in very high differential pressure services.
Parallel Slide Design: The gate is a split design using two discs
spring loaded and held together by a gate holder with an Inconel
750 spring to provide initial energizing when closed. The gate
relies for seat tightness on the primary fluid pressure acting on
the down- stream half. There is no wedging action or extra loading
on the seats resulting in considerably lower operating torque. When
the valve is in the open position the gate is completely clear of
the seats. During closing there is a bevel on the bot- tom of the
gate to guide it in between the seats and recompress the spring.
Seating surfaces are hardfaced with Stellite®6 to provide high
cycle capability in very high differential pressure services.
Gate Valves Features
