Through Conduit Gate Valves Slab & Expanding
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1 Through Conduit Gate Valves Slab & Expanding
2 Through Conduit Slab Gate valve Slab Gate Valves are manufactured with a full bore port, rising stem OS&Y and with floating seats and gate, pressure energized, for a bubble tight shut off upstream and downstream under both low and high differential pressure. Double block and bleed capability and automatic relief of excess body pressure are a 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 the 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. Through Conduit Slab Gate valve Features Negligible Pressure Drop Self Relieving Double Block and Bleed performances Equalized Bore (as required/operated) Possibility of reverse acting and equalized bore for fail closed operation Double seal upstream by piston effect, down-stream with floating obturator Superior Seal Performances (Bubble Tight) Suitable for all types of fluids (including abrasive fluids) TYPICAL ADVANTAGES Suitable for ESDV/BDV applications and Pig Traps Extremely flexible actuation with or without stem ejection assistance Robust Construction Full In-Line maintainability Fire Safe construction PRODUCTION RANGE 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 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 FEATURES Stem/Stem seal The stem is designed with a threaded-in T bar allowing relative motions of the gate under line pressure. The stem seal uses braided graphite gaskets ensure sealing integrity. Stem sealant injection system is achieved through a port located on the bonnet. In case of leakage through the stem seal it is possible to inject the sealant through the stem packing release valve. VALVE MATERIALS Slab Gate valves are manufactured using a wide range of materials, from carbon steel to alloys. A typical material selection is as follows: Service Body Bonnet Trim Seat Insert General non corrosive Moderate corrosive Low temperature A216 WCB A216 WCB A352 LCC A105 A105 LF2 A105 + ENP F6A LF2 + ENP Nylon/RPTFE Nylon/RPTFE Nylon/RPTFE Seat Seats are ENP coated and are provided with thermoplastic soft insert on their face. A double face seal effect is obtained due to metallic contact between the seat and the gate, thus increasing the reliability of the valve. Metal-to-metal seating is available for abrasive service. In such case gate and seat faces are coated with HVOF Tungsten Carbide coating. Fig. 1 Seat detail Fig. 2 Stem injection detail
3 Through Conduit Slab Gate valve Through Conduit Slab Gate valve Seats are shown during double seal action Valbart s Through Conduit Slab Gate Valves offer increased value by incorporating advanced design features Seats are shown with upstream seat in self relieving action UPSTREAM SIDE DOWNSTREAM SIDE Fire-safe design Valbart Through Conduit Slab Gate valve is available in the API 6FA fire-tested design. Fire-tests have been witnessed and certified by independent authorities. Valbart Fire tested gate valves offer the highest resistance against fire. The body seal is a spiral wound graphite/aisi 316 gasket and the stem seal is a die-formed/braided graphite packing. The stem incorporates the back seat feature to allow stem seal re-packing with valve in service. Fire-tests certification is available and can be provided upon request. Easy maintenance Valbart Srl Through Conduit Slab 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. Double Block and Bleed Double block and bleed capability and automatic relief of excess body pressure are standard features of Valbart Through Conduit Slab 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 and to achieve double isolation between the two sides and avoid any risk of product contamination Single piston effect seats Seats rings are floating type and are energized against the gate by means of helical springs. The initial seating is enough to assure sealing between gate and upstream seat when the line pressure is applied. The gate allows axial movement and the upstream force derived from line pressure force the gate against the downstream seat creating a double, bubble tight barrier. Additional features (Available on request) Self relieving features The single piston design with the possibility of both seats and gate to float, permits the automatic release of any overpressure in the body cavity. Consequently, the seat rings are self-relieving. Fully piggable Valbart Through Conduit Slab Gate Valves 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. Metal seated/tungsten Carbide coating for abrasive fluids Stem extension for buried service/high temperature service Inconel 625 cladding of the sealing surfaces for corrosive service CRA alloys for very corrosive media (Duplex,UNS S31254,UNS S34565) Seat Sealant Injection system for Emergency Sealing Transition Pipe Pups welded to the valve ends Position indicator Actuation (Electric, Pneumatic and Hydraulic actuators)
4 Through Conduit Double Expanding Gate valve PRODUCTION RANGE 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 VALVE MATERIALS Offshore/Onshore applications Double block and bleed applications Sub-sea applications Scrapers/Pig Traps/Pig Launchers and Receivers Valbart Srl 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. 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 Valbart Srl Through Conduit Double Expanding Gate valves are manufactured using 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 Oil and gas production/transportation isolation Upstream gas compressor isolation Critical and Primary isolation Through Conduit Double Expanding Gate valve 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 of further upward movement and the Gate slides upwards along 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 further downward movement, simultaneous upstream and downstream sealing is achieved when the centralizer mechanism allows the Gate-Segment to expand, sealing against both seats.
5 Through Conduit Double Expanding Gate valve 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) TYPICAL ADVANTAGES Particularly indicated for Pig Traps isolation Extremely wide range of operating pressure and temperatures Extremely robust construction Intrinsically Fire Safe construction Through Conduit Double Expanding Gate valve Fire-safe design Valbart Through Conduit Expanding Gate valve is available in the API 6FA fire-tested design. Fire-tests have been witnessed and certified by independent authorities. Valbart Fire tested gate valves offer the highest resistance against fire. The body seal is a spiral wound gasket or Ring Joint / BX depending on the valve service and rating, and the stem seal is a die/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 Valbart 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. 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). 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 Valbart Srl 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 maintenace Valbart Srl 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.
6 RELATED PRODUCTS Double block and bleed valves Available in the following size # - 600# 900# # # * Larger size available upon request Rising Stem Friction Free Ball Valves BODY BALL STEM SEAT STANDARD MATERIAL LIST ASTM A105N/ASTM A216 WCB ASTM A182 F316/ASTM A351 CF8M ASTM A352 LCC/ASTM 350 LF2 ASTM A105N + STELLITE 6 ASTM A182 F316 + STELLITE 6 ASTM A352 LCC/ASTM 350 LF2 + STELLITE 6 ASTM A536 TP630 ASTM A105N + STELLITE 6 ASTM A182F316 + STELLITE 6 ASTM 350 LF2 + STELLITE 6 * Other materials are available upon request RELATED PRODUCTS The Double Block and Bleed Isolation Philosophy requires two in-line isolation valves and a bleed valve, used to drain or vent trapped fluid between the two closure elements in order to safely isolate safely the downstream pipe. This feature can be achieved with one single valves c/w a bleed port between the obturators. MAIN APPLICATIONS ADVANTAGES CHARACTERISTICS MAIN APPLICATIONS FEATURES Offshore oil & gas production Gas & oil terminals Chemical & Petrochemical Refining Fiscal Metering Skid Manufacturing LNG gas carrier Process/ Power industry contractors Space and weight saving Cost saving (product & installation) Minimized leak paths Increased line structural integrity ESDV+MOV or ESDV+XV configurations Increasesd reliability of the system Anti blow out/low emission stems Fire safe & anti-static design Independent ball and stem Self aligning trims Self relieving/ Double piston effect floating seats Soft or metal seated Design is available in side entry, (bolted, welded body) and for onshore, offshore (top side) or sub-sea configurations. Bleed/Vent system can be provided with Globe, Gate or Ball valves as per customers requirement. Molecular Sieve frequent cycling Isomerisation Thermal (hot) Oil Critical Services with Bellow Seal construction High temperature Low (Cryogenic) Off shore (produced water) Low maintenance due to full friction free opening and closing, excellent for frequent cycling Linear stem operation, no rotating, excellent for linear operation/actuation Standard with STELLITE6 ball and seat sealing area Extended life time due to selection of high quality materials against wear and corrosion Presence of Backseat enables stem packing to be renewed when valve is under pressure and in fully open position Gland packing design with normal gland flange and follower (no lubricated seal) for easy adjusting of stem packing without special tools Heavy wall thickness (in excess of ANSI B16.34 wall thickness) as per API 600/API 6D for extra corrosion allowance Seat tightness up to Class VI and ZERO leak through special lapping techniques Top entry design for in line inspection and/or maintenance
7 For Information on Valbart Specialized valves, please refer to the following leaflets: 2011 Valbart Srl - All Rights Reserved. - VBENBR1007 Via delle Industrie, 9/ Mezzago (MB) ITALY valbartsales@flowserve.com Phone: Fax:
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