Válvula de compuerta de losa de conducto pasante, ASTM A216 WCB, 4 IN, 600 LB

Válvula de compuerta de losa de conducto pasante

Nombre: a través de la válvula de compuerta de losa de conducto
Tamaño: 4 pulgadas, DN100
Estándar: API 6D
Presión: Clase 600 LB, PN100
Material: ASTM A216 WCB
Potencia: Manual, actuador eléctrico, actuador neumático
Temperatura: -29 ℃ - 540 ℃
Característica: válvula de compuerta de losa, válvula de alivio automático con actuador eléctrico

Gama de productos

Tamaño: NPS 2 pulgadas - 64 pulgadas
Presión: Clase 150-2500 LB
Conexión: ASME B16.34 B16.25 B16.47 Nace MR01.75 ASME VIII Div.1

Las válvulas de compuerta de placa VERVO Through Conduit (T.C.) se fabrican con un puerto de paso total, OS&Y de vástago ascendente y con asientos y compuerta flotantes, energizados por presión, para un cierre hermético aguas arriba y aguas abajo bajo presión diferencial baja y alta. La capacidad de doble bloqueo y purga y el alivio automático del exceso de presión corporal son características estándar de este diseño de asiento. El orificio liso y continuo minimiza la turbulencia dentro de la válvula y, cuando está en la posición abierta, produce una caída de presión equivalente a una porción de tubería de la misma longitud y diámetro. Las caras de los asientos están fuera de la corriente de flujo y, por lo tanto, están protegidas de la acción erosiva del flujo. Los cerdos y los raspadores pueden pasar por la válvula sin sufrir daños.

CARACTERÍSTICAS DE LA GAMA DE PRODUCCIÓN
Las válvulas de compuerta de losa están disponibles en los siguientes tamaños y clasificaciones de presión:
Clase 150# de 2" a 64"
Clase 300# de 2" a 64"
Clase 600# de 2" a 64"
Clase 900# de 2" a 48"
Clase 1500# de 2" a 42"
Clase 2500# de 2" a 24"

ESTÁNDARES APLICABLES
Las válvulas de compuerta de losa cumplen con API 6D / API 6D SS y todos los códigos internacionales relevantes:
ASME B16.34
ASME B16.25
ASME B16.47
Nace MR01.75
División ASME VIII. 1

MATERIALES DE LA VÁLVULA
Las válvulas de compuerta de placa VERVO Through Conduit (T.C.) se fabrican utilizando una amplia gama de materiales, desde acero al carbono hasta aleaciones.
Una selección típica de material es la siguiente:
 
Features of Through Conduit Slab Gate valve
TYPICAL ADVANTAGES

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
Robust Construction
Full In-Line maintainability
Fire Safe Construction

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 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.

Seat
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.

Fire-safe design
VERVO Through Conduit Slab Gate valve is available in the API 6FA fire-tested design. Fire tests have been witnessed and certified by independent authorities. VERVO 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.

Fully pluggable
VERVO 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.

Easy maintenance
VERVO 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 VERVOThrough 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
Position indicator
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".

Easy maintenance
VERVO 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.