Gate Valves
THE GATE VALVES
Gate valves can be left open, or
closed, on a variety of water, gas and chemical duties for long periods
with the sureness of satisfactory operation when needed. Attempting fine
control or throttling could induce serious gate erosion. Overhead
clearance for high steam, high lift valves is needed for installation and
maintenance. Service with heavy solids in suspension could be
troublesome-possibly creating seat wear and shut-off problem.
A multi-turn valves which has
a gate-like disk and two seats to close the valves. The gate moves
linearly, perpendicular to the direction of flow. This type of valves is
normally used in the fully opened or fully closed position. It is not
suited to throttling applications, Gate valves provide robust sealing, and
are used extensively in the petrochemical industries. This class of valves
also includes knife gate valves, conduit gate valves and wedge gate
valves. Knife gate valves have much thinner gates with a knife-like edge,
making them suited to use with floating solids, e.g., as in the pulp&
paper industries . conduit gate valves have a rectangular disc as the
closing element. One half of the disk is solid, to close the valves, the
other has a circular port, which can be used to open the valves. Wedge gate
valves have a wedge-shaped gate which" wedges?between floating seats to
close the valves tightly.
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A guillotine valves has
been preferred to a spherical valves concept which implied a too long
stroke for the filter. The closing and locking operations of the valves is
as follows; first, the gate valves is pushed by a screw driven by the
motor, from its retracted position towards closed position. When the gate
valves reaches this position (the extremity of the caplet against the body)
the gate valves inside mechanism activated by the screw makes its thickness
increase until the movement is stopped by the main body of the
valves.
Our Top Flow
Rubber Seated Gate Valves are manufactured with the care and
craftsmanship you would expect from a company that specializes in design
and manufacture of valves for the petroleum industry.
All Top Flow
products are designed and tested to ensure reliability and integrity for
long-term safe operation. They are also engineered, manufactured and
tested under our ISO 9001 Certified Quality Program. Each valves is subject
to visual inspections; pressure testing and all critical dimensions and
specifications to meet API and ANSI codes. All materials used in the
manufacturing process meet or exceed ASME and ASTM specifications.
Every Gate Valves
features easy-to-replace seats that ensure tight sealing, even under the
most rigorous field conditions. From design to manufacture to testing Top
Flow Rubber Seated Gate Valves are built for reliable and safe
performance in the field.
- Wellheads
- Pipelines and manifolds
- Drilling and treatment chemicals
- Oil, gas
and water lines
- Sour gas and crude oil
- Abrasive and corrosive
mud,
cements, slurries and water flood
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