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ANSI Valves - Gate Valve

Especificaciones Técnicas para Válvula de Compuerta

 

Design and Manufacturing

Cast steel gate valve to API600
(ISO 10434) or API 6D; Cast stainless steel gate valve to API
603 or API 600; Forged steel gate valve to API 602. Inspection
and Test: API 598, API 600 or API 6D.
End flange dimension: ASME B16.5 (for NPS≤24) ; ASME
B16.47 series B, API 605 or ASME B16.47 series A, MSS SP-44
(for NPS>24).

 

 

 

Body and Bonnet Connection

BW end dimension: ASME B16.25.
Socket-weld dimension: ASME B16.11.
Face to face and end to end: ASME B16.10.
Pressure-temperature ratings: ASME B16.34.


The body and bonnet of Class150 – Class900 gate valves are usually connected with studs and nuts. And the body and bonnet of Class1500 – Class2500 gate valves are usually of pressure seal.

 

Stem Nut

Usually, the stem nut is made of copper alloy. It is also can be made of ASTM A439 D2 if being requested by the customer.
For large sized gate valves ( NPS 10 for Class 150, NPS 8 for Class 300, NPS 6 for Class 600, NPS 5 for Class 900), rolling bearing is fitted at the two sides of the stem nut in order to minimize the open and close torque of the gate valve.

 

Design of Disc

Gate Valves with NPS ≥ 2 are of flexible wedge;
Gate valves with NPS < 2 are of solid wedge.

 

Actuation

Hand wheel or gear box is usually used for gate valve actuation.Chain wheel and electric actuator can be also used for gate valve actuation if being requested by the customers.

 

Seat

For carbon steel gate valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy specified by the customer. Renewable threaded seat is used for NPS ≤ 10 gate valves, and welded on seat can be also optional if being requested by the customer.

 

Welded on seat is used for NPS > 10 carbon steel gate valves. For Stainless steel gate valve, integral seat is usually adopted, or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel gate valve if being requested by the customer.

 

 

 

 

 

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