Carbon Steel Parallel Double Disc Flat Gate Valve

The JOEPAI high quality Carbon Steel Parallel Double Disc Flat Gate Valve adopts a unique metal contact structure, which is reliable in action and has extremely high cutting performance. It is widely used in emergency shut-off valves and vent valves under high pressure to extremely low temperature conditions. In addition, the metal contact structure itself has a fireproof function.

Product Specification

1.Design manufacture according to API 6D

2.Face to face according to ASME B16.10

3.End flange dimension according to ASME B16.5

4.Valve inspection and test according to API 598

Casing Material: WCB, WC6, WC9, CF8, CF8M, CF3, CF3M

Disc Material:  WCB, WC6, WC9, CF8, CF8M, CF3, CF3M

Stem Material: 2Cr13, 304, 316, 304L, 316L

Bonnet Material: WCB, WC6, WC9, CF8, CF8M, CF3, CF3M

Seat Material: A105, 304, 316, 304L, 316L

Connection type: Flange/Welding

Nominal Diameter: DN100-800 NPS2"-32"

Nominal Pressure:   1.0-16.0MPa  150LB-900LB

Applicable working conditions

1. Hydrogenation unit

2. High temperature steam condition

3.  Hot oil working condition

4. Oil tank storage area

Product Features

1. Anti swelling measures under high temperature conditions

2 top mounted design, capable of online maintenance

3 bidirectional forced pre tightening seals for more reliable sealing

4 can achieve zero leakage

5. Low opening force

Structural characteristics

The wedge degree of the wedge block of the parallel double gate valve is much greater than the self-locking angle, making it easy to open and requiring less power.

When the Carbon Steel Parallel Double Disc Flat Gate Valve is fully opened, a metal seal is formed between the end of the valve stem and the hard alloy welding sealing surface of the valve cover. At this time, there is no medium pressure at the packing, and the packing can be replaced online.

Adopting a support open structure design can provide a greater forced sealing preload force, making the seal more reliable.

The valve cover can be made into various structures according to actual working conditions, such as using corrugated pipe sealed valve cover for toxic media, using heat dissipation valve cover for high temperature, and using self sealing valve cover for high pressure, ensuring the safe and reliable use of the valve.

Low leakage packing is selected as the filling material, and a disc spring loading design is used at the packing location for more reliable long-term sealing.

By using advanced surface extrusion technology to increase the surface hardness of the valve stem and reduce roughness, the wear of the packing during the valve opening and closing process can be reduced, while preventing valve stem strain.

The middle flange is sealed with a metal wrapped gasket, which has good sealing performance and fire prevention function.

The sealing structure composed of two parallel gate plates and wedge tightening devices replaces the traditional wedge gate valve structure, making the opening and closing process of the valve easier.

The valve internals are designed entirely of metal and can withstand high temperature media. The wedge-shaped block adopts a large wedge angle design, which allows it to be easily pulled out even under high temperature conditions without any swelling or dead phenomenon.