Name: Through Conduit Slab Gate Valve
Size: 4 Inch, DN100
Standard: API 6D
Pressure: Class 600 LB, PN100
Material: ASTM A216 WCB
Power: Manual, Electric Actuator, Pneumatic Actuator
Temperature: -29℃ - 540℃
Feature: Slab Gate Valve, Electric Actuator Self-Relieving Valve
Size: NPS 2 Inch - 64 Inch
Pressure: Class 150-2500 LB
Connection: ASME B16.34 B16.25 B16.47 Nace MR01.75 ASME VIII Div.1
Our 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 standard features 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.
PRODUCTION RANGE FEATURES
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″
Slab Gate valves comply with API 6D / API 6D SS and all relevant international codes:
ASME VIII Div. 1
|A105 + ENP
|LF2 + ENP
Features of Through Conduit Slab Gate valve
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 Per formances (Bubble Tight)
Suitable for all types of fluids (including abrasive fluids)
Suitable for ESDV/BDV applications and Pig Traps
Extremely flexible actuation with or without stem ejection assistance
Full In-Line maintainability
Fire Safe Construction
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 to ensure sealing integrity. The 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.
Seats are ENP coated and are provided with a 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 a case, gate and seat faces are coated with HVOF Tungsten Carbide coating.
Our Through Conduit Slab Gate valve is available in the API 6FA fire-tested design. Fire tests have been witnessed and certified by independent authorities. Our 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 the valve in service. Fire-test certification is available and can be provided upon request.
Our 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.
Our 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 OurThrough 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 achieve double isolation between the two sides and avoid any risk of product contamination
Single piston effect seats
Seat rings are floating type and are energized against the gate by means of helical springs. The initial seating is enough to assure sealing between the gate and upstream seat when the line pressure is applied. The gate allows axial movement and the upstream force derived from line pressure forces the gate against the downstream seat creating a double, bubble-tight barrier.
Additional features (Available on request)
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
Actuation (Electric, Pneumatic and Hydraulic actuators)
Self relieving features
The single piston design with the possibility of both seats and gate to floating permits the automatic release of any overpressure in the body cavity.
Consequently, the seat rings are "self-relieving".
Our 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.