assemb gate valve 2001 BODY

Available both in cast and forged steel, it has been designed to meet all the requirements of ASME, API and British Standards

The body-bonnet connection is made by a pressure seal gasket. Its pre-stress condition is achieved by means of bolts screwed to the bonnet flange.

Ends are normally butwelding although they can be also flanged on request.

All bodies are provided with integrally cast bosses, located and sized in accordance with ASME B16.34, which allow the provision of drain and by-pass connections, supplied on request.


Usually constructed in the same materials as the body, being designed so that the wall thickness always exceeds the requirement of API 600.

A back seat bush (13) is fitted inside the bonnet lower cavity, to provide a closure when de valve is fully opened. This permits the valve to be repacked while in service.

The bonnet has a deep stuffing box in which packing rings are placed.

Stuffing box is designed with sufficient space to allow lantern ring to be fitted.


Separate rigid yoke provided to withstand the thrust of the actuator. Large windows allow easy access and ventilation of the packing area. The yoke is connected to the body by a two piece clamping ring (193) an four clamp bolts. This connection is very solid and enables easy maintenance at site.

The upper part of the yoke is suitably machined to house the yoke sleeve (11).

The yoke is usually made of cast carbon steel regardless the type of body material, unless otherwise required by the client.


Constructed in stainless steel, machined from solid bar stock. The single piece stem in connected to the wedge by a tee connection.

A conical shoulder is also provided to ensure effective and tight seal backseat which allows the stuffing box to be replaced with the valve in service. The stem dimensions conform to API 600. Connection stem-wedge also meets the requirements of API 600. Pull test has been carried out to verify the design. Special care is taken in the machining of the stem, including the final polishing of the travelling area (contact with the stuffing box). This allows a low-friction surface and a superior corrosion resistance.


The gland studs are of the eyebolt type, which can be swing outwards for ease of gland repacking.


They are supplied in forged stainless steel, hardfaced with Stellite-6 (2 mm of minimum thickness). Seat rings are renewable, normally welded to the body.

Sealing contact surfaces, are lapped for a perfect tight seal. Controlled hardness differentials are maintained between the wedge discs and the seat rings, as required by API 600 Std.


The wedge is normally constructed in forged stainless steel for diameters up to 3”, and in cast steel for larger sizes.

Wedge is commonly flexible, though it can be also solid. Guides are carefully machined for a smooth sliding in the body cast-in guides.

Contact faces are overlayed with stellite-6 (2 mm. ominimumn. thickeness).


The connection between body and yoke is created by means of a bipartite clamping ring. The internal connection between the clamp, body and yoke is conical, assuring a perfect tightening.


Designed to permit removal from the bonnet or yoke while the valve is in service.

The yoke bushing assembly is mounted in ball bearings. It is normally made of cast aluminium bronze, having high resistance to wear and high melting point. Other materials such as

Ni-resist can be supplied on request.


The back seat can be supplied as a threaded stainless steel bush, welded to the bonnet or of integral type. It can be hardfaced with Stellite-6 or orther materials as required.

This seat allows the valve to be repacked under pressure.


The handwheel can be supplied either in cast construction of fabricated from steel tube.

The handwheel is designed to allow easy operation of the valve. Other types of control are available and, in some cases, are indispensable for a good operation, for instance:

  • Chain wheel
  • Gear operator
  • Hammer handwheel
  • Geared hammer handwheel
  • Electric actuator
  • Electro-hydraulic actuator
  • Pneumatic actuator


Designed sufficiently resistant to withstand the forces transmitted by the bonnet screws (111).

The bonnet retainer is normally made of the same material as the body, but it can be constructed in any other material on request. It is machined to match exactly with the body, what guarantees a perfect alignment of the unit.

Gate valve spacer ring132-SPACER RING

Made of a single piece coverting the upper part of the pressure seal gasket. It is normally manufactured in the same material as the body.


It is made normally of the same material as the body, and constructed in four pieces, called segments. The segments are sized to minimize the gap among them.

The segmental ring supports all the forces transmitted from the bonnet through the spacer ring. It is calculated to withstand all the force without cracking.


The pressure seal gaskets are usually supplied of compressed graphite, bordered on the upper and lower edges with braided filaments of graphite and Inconel.

Gaskets can also be made in stainless steel.


They are supplied in two separate self aligning pieces, to ensure uniform pressure is effected during tightening of the packing.

The upper part of the gland, which comes in contact with the gland flange, is spherical in shape.

The gland flange is made of carbon steel but, upon request, other materials can be supplied.


Packing is made of an adequate number of preformed rings.

For general applicatios high grade graphite material is supplied, using compressed rings in the center and braided anti-extrusion rings on top and bottom. Graphite is selected of an approved quality.

Other types of packing are also available for particular services.