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GATE VALVE
Product Description
Pressure seal valve are intended for high pressure and high temperature appilications in all types of fluid, except where severe coking may occur.
A selection of design and material would give an excellent service in nuclear steam generating stations, industrial/chemical plants and thermal power plants.
The pressure seal valve provide the most efficient use for flow passage and sealing, and result in significant weight saving and ease and simple installation and maintenance.
Manufacturing and quality assurance procedures include extra controls of dimensional and non-destructive examinations and tests on critical areas such as gasket sealing, weld ends, or stellite sealing surfaces.
Product Specifications
FLEXIBLE GATE
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A flexible wedge is a one piece and fully guided cast with a central hub allowing the seating faces to move reciprocally and thus compensating for the distortion on body seats due to thermal expansion or pipe loads. Seat ring and wedge seating face are set to 9°angle from the vertical to minimize the sliding contacts between wedge and seat ring while opening or closing them. Wedging helps lead to a tight seal in a low differential pressure service. A flexible wedge resists wedge sticking or binding in a service. The wedge may be closed in a hot condition and opened in cold. The seating surface are stellited to provide high cycle capability in a very high differential pressure service. |
STANDARD PRESSURE SEAL DESIGN
A segment thrust ring absorbs all the thrusts applied by internal pressure. A protective ring made by hardened stainless steel prevents the deformation on the top surface of soft metal gasket.
The gasket can be removed smoothly without any damage on the sealing surface of body.
PACKING ADJUSTMENT
All gate and globe valve have a two-piece packing gland to minimize the scoring on valve stem which may occur if tightened unevenly.
Gland bolts remain fastened to the bonnet.
They swing out of the way to simplify the packing replacement and are oriented to adjust the packing from one side of valve.
DEEP STUFFING BOXES
Deep stuffing boxes are standard type for gate and globe valve.
They allow for extra packing to ensure more reliable stem seal and sufficient packing depth containing an optional lantern ring in the middle of box. where lantern ring is included, a tapped and plugged hole is made.
If specified, a ball grease injector can be fitted with.
BEARING INSERT TYPE YOKE SLEEVE
Large and high pressure valve may require a tremendous amount of torque to open or close the valve.
Ball bearing in the yoke sleeve will reduce the operating torque of valve by up to 50 percent.
END CONNECTION
- R.F FLANGED ENDS TO ASME B16.5
- B.W. ENDS TO ASME B16.25
- R.T.J FLANGED ENDS TO ASME B16.5
- SIZE 26" AND LARGER, FLANGED ENDS ACCORDING TO ASME B16.47 SER.A OR SER.B
Usage
The gate valve is normally used for on-off service.
It is not recommended for throttling.
The gate valve is normally installed to pipe horizontally and the valve stem stands vertically.
It can also be mounted to the vertical direction with the stem facing to the opposite or other directions except the vertical, provided that a special construction is prepared depending on the valve size , service conditions, or materials.
In case of valve purchase for a special purpose other than the normal installation, the orientation of valve should be specified.
After the gate valve is closed completely with a sufficient force enough to shut off, the stem should be backed slightly about 1/8 to 1/4 turn to relieve the load on stem.
This will cause the stem to expand a little without valve bending or damage, not affecting the valve shutoff.