Structural Features Of Bellow Seal Globe Valve

Structural features of bellows globe valve

The intercepting steam globe valve (also known as the "bellows globe valve") is designed with double-layer bellows, which are welded to the stem to maintain stable operating performance and avoid stem vibration due to valve plug vibration.

In the case of high temperature, the stem is not in contact with the medium, ensuring zero leakage of the stem. At the same time to ensure sufficient strength and toughness can be opened and closed tens of thousands of times. The handwheel is ergonomically designed for longer service life and easy and convenient operation. The opening and closing parts of the steam globe valve are plug-shaped valve flaps with a flat or tapered sealing surface, and the flaps move in a straight line along the centerline of the fluid, also called a shut-off door, which is the most widely used kind of valve, and it is popular because of the small friction between the sealing surface during opening and closing, more durable, small opening height, easy manufacturing, convenient maintenance, not only for low and medium pressure but also for high pressure. Widely used in food, medicine, petroleum, chemical, natural gas, steel, environmental protection, paper, and other transport pipelines to do media cut-off or circulation.

Features of bellows disconnecting valve.

1. Double sealing design (bellows + packing) If the bellows fail, the stem packing will also be avoided.

2. The product has a reasonable structure, reliable sealing, excellent performance, and a beautiful shape.

3. No fluid loss, reduce energy loss and improve the safety of plant equipment.

4、Overlaying cobalt-based hard alloy, covering layer is dense, wear-resistant, corrosion-resistant, good wear resistance, long service life, less maintenance, and low operating cost.

5、Sturdy and durable bellows seal design ensures zero stem leakage and provides maintenance-free conditions.

6、Stem tempering and surface nitriding treatment, with good anti-corrosion and anti-friction properties.

7、More intuitive indication of stem lift position.

8, double sealing, more reliable performance, zero leakage.

9, parts material, flange, and butt welding number size according to the actual working conditions or user requirements reasonable optional, to meet a variety of engineering needs.

To meet the needs of various projects.

Bellows disconnecting valve principle of operation.

Relying on the steam pressure, the valve sealing surface and seat sealing surface closely fit, to stop the flow of media. 

Bellows disconnecting valve selection note: 1.

1, the globe valve is suitable for a small diameter pipeline to adjust the flow, pressure and accuracy requirements are not high or often closed to cut off the flow of one-way flow on the pipe section.

2, due to the large resistance of the shut-off valve, relatively suitable for the flow resistance requirements of the less stringent pipeline.

3, not suitable for viscosity or particles containing easy-to-precipitate media.

Construction, and installation points.

1, installation location, height, import, and export direction must meet the design requirements, the connection should be solid and tight.

2, installed in the insulation pipeline on all types of manual valves, the handle shall not be down.

3, steam shut-off valve must be installed before the appearance check, for working pressure greater than 1.0 MPa and in the main pipe to cut off the role of the valve, should be installed before the strength and tightness of the performance test, after passing before use. Strength test pressure for the nominal pressure of 1.5 times the duration of not less than 5min, the valve shell, packing should be no leakage for qualified. The tightness test pressure of 1.1 times the nominal pressure.

4, handwheel, handle and transmission mechanism, are not allowed for lifting.

5, the flow direction of the medium should be consistent with the direction of the arrow shown on the valve body.

Application areas:

Petroleum, petrochemical, chemical, metallurgy, electric power, water conservancy, urban construction, machinery, coal, food, industrial (main steam trapping, boiler drainage, blast furnace system, hot air furnace system, thermal system, steam system, etc.)

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