Expanding Gate Valve

Expanding Gate Valve

Expanding Gate valve Through Conduit Double Expanding Gate Valves are manufactured with a full bore port and with 2-piece (gate + segment) obturator designed for a positive, bubble tight shut off upstream and downstream under both low and high differential pressure. Double block and bleed...

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Product Details

Expanding Gate valve

Through Conduit Double Expanding Gate Valves are manufactured with a full bore port and with 2-piece (gate + segment) obturator designed for a positive, bubble tight shut off upstream and downstream under both low and high differential pressure. Double block and bleed capability and high robustness are standard feature of this seat design.

The smooth, continuous bore minimizes turbulence within the valve and when in the open position it produces a pressure drop equivalent to a portion of pipe of same length and diameter. The seat faces are outside the flow stream and therefore protected from the erosive action of the flow.

Pigs and scrapers can be run through the valve without damage.


PRODUCTION RANGE 
Through Conduit (T.C.)
Slab Gate Valves are available in sizes and pressure ratings as follows:
•Class 150# from 2″ through 64″
•Class 300# from 2″ through 64″
•Class 600# from 2″ through 64″
•Class 900# from 2″ through 48″
•Class 1500# from 2″ through 42″
•Class 2500# from 2″ through 24″

 

APPLICABLE STANDARDS 
Slab Gate valves comply with API 6D / API 6D SS and all relevant international codes:
•ASME B16.34
•ASME B16.25
•ASME B16.47
•NACE MR01.75
•ASME VIII Div.1


VALVE MATERIALS 
Through Conduit Double Expanding Gate valves are manufacture during a wide range of materials, from carbon steel to alloys, in order to comply with all the possible services (Hydrocarbons, Mildly to Highly Corrosive, NACE, etcetera) and applications. ns, Mildly to Highly Corrosive, NACE, etcetera) and applications.


MAIN APPLICATIONS

•Offshore/Onshore applications
•Double block and bleed applications
•Sub-sea applications
•Scrapers/Pig Traps/Pig Launchers and Receivers
•Oil and gas production/ transportation isolation
•Upstream gas compressor isolation
•Critical and Primary isolation


Principle of operation
The Through Conduit Double Expanding Gate Valve comprises of a two piece   wedged shape assembly consisting of a Gate and a Segment. The Gate is   attached and driven by the stem and a centralizer helps in retaining the   Gate-Segment assembly until sealing through expansion is required. Positive   sealing is achieved in both high and low pressure conditions by expanding the   Gate and the Segment out towards the seats while in a closed position.


Gate in fully open position
In a fully open position, the Segment is incapable off urther upward movement   and the Gate slides upwards long the wedge angle of the Segment, expanding   both the Gate and the Segment. The centralizer mechanism allows the   Gate-Segment assembly to expand against the seats and protect the seat faces   from the line flow.


Gate in running position
In the running position, the centralizer holds the assembly together,   preventing relative movement between the Gate and Segment and holding them in   a neutral position until sealing expansion is required.


Gate in fully closed position
With the Segment incapable of fur the downward movement, simultaneous   upstream and downstream sealing is achieved when the centralizer mechanism   allows the Gate-Segment to expand sealing against both seats.


Design features

•Positive Sealing (Capability of improving seal tightness by increasing the stem thrust)
•Through Conduit – Negligible Pressure Drop
•Double Block and Bleed performances
•Double seal (both up and downstream seats contribute to guarantee tight seal)
•Bi-Directional (with preferred flow direction)
•Full In-Line maintainability
•Suitable for all types of fluids
•Superior life of seat sealing surface(metal/non-sliding seats)
•Particularly indicated for Pig Traps isolation
•Extremely wide range of operating pressure and temperatures
•Extremely robust construction Intrinsically Fire Safe construction


MAIN FEATURES

Seats
Seats are Tungsten Carbide HVOF (High Velocity Oxy Fuel) coated with Metal to Metal contact between seats and gate. Seat faces protected from emersion The seat faces are outside the flow stream and protected from the erosive action of the flow Stem/stem seal The stem is designed with a threaded T bar allowing relative motions of the gate under line pressure. The stem seal uses graphite seals to insure sealing integrity. Upon request a Chevron packing is available. The stem seal is provided with a lantern ring, and may be provided with secondary injection fitting and stem packing release valve (optional features).

Fire-safe design
Through Conduit Expanding Gate valve is available in the API 6FA fire-tested design. Fire-test shave been witnessed and certified by independent authorities. Fire tested gate valves offer the highest resistance against fire. The body seal is aspiral wound gasket or Ring Joint / BX depending on the valve service and rating, and the stem seal is adie/formed /braided graphite packing. Fire-tests certification is available and can be provided upon request.

Double block & bleed
Double block and bleed capability is a standard feature of  Through Conduit Expanding Gate Valves. With the valve fully closed and pressure on both sides, it is possible to bleed the pressure from the body cavity to check seat seal integrity.

Double isolation
This feature is obtained since the valve sealing is granted not only by the line pressure but also by the external force used to close the valve (i.e. positive sealing)

Fully piggable
Through Conduit Expanding Gate are designed to be Fully Piggable. Pigs and scrapers can be run through the valve without any damage to the internal structure of the valve.

Easy maintenance
Through Conduit Expanding Gate valve design minimizes and eases the maintenance allowing for the service operations to be done without the removal of the valve from the line.

 

 


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