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Metal hard seal ball valve

Describe:The valve stem is equipped with a protective device to prevent the valve stem from downward movement caused by abnormal external force, which is composed of a protective sleeve and a screw nut. The protection device can adjust the distance in the valve assembly process through the thread reserved on the stem to prevent the stem from moving downward due to external force, so as to avoid damaging the valve seal.

  • Diameter:DN15-DN200
  • Pressure:PN16-PN100
  • Temperature:-40℃—450℃
  • Texture of material:不锈钢
  • Model:BOLON
  • Nature of manufacturer:美国·勃朗
  • Update time:2021-1-27
  • Visits:168
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Detailed introduction

Metal hard seal ball valve

characteristic

1. Zero leakage seal

Each valve meets the test requirements of Asne B16.34, and hydrostatic shell and seat leakage tests are conducted in accordance with mss-sp-61 standard. Every valve of Volk ensures zero leakage.

2. Stem protector

The valve stem is equipped with a protective device to prevent the valve stem from downward movement caused by abnormal external force, which is composed of a protective sleeve and a screw nut. The protection device can adjust the distance in the valve assembly process through the thread reserved on the stem, so as to prevent the stem from moving downward due to external force, so as to avoid damaging the valve seal.

3. Anti ejection valve stem

The shaft shoulder of the stem ferrule installed inside the valve body is larger than that of the valve body, which can prevent the valve stem from ejecting outward.

4. Reliable packing gland design and application of primary spring can ensure long service life and less maintenance of valve stem packing, so as to ensure no leakage.

5. Isolated body cavity

During the operation of the valve, the ball always keeps in contact with the valve seat, so as to isolate the body cavity from the fluid and prevent the accumulation of solids.

6. Angle stroke valve

The rapid 90 degree rotation of the valve stem reduces the wear of the valve stem and the packing, and prolongs the service life of the packing. Angular rotation operation and zero leakage make the valve the best choice for emergency shutdown.

7. HVOF spraying

The surface of ball and valve seat are coated with chromium carbide layer made by high speed flame spraying technology. All balls and seats are grinded one to one to ensure the zero leakage and friction performance of the valve and prolong the service life of the valve.

8. Inconel 718 bearing disc spring

The bearing disc spring can make the valve seat in close contact with the ball, which can protect the valve seat well when the valve is in the fully open and fully closed position. It allows thermal expansion and temperature cycle change, and does not affect the normal operation of the valve, so that the valve can ensure zero bubble sealing under high pressure and pressure conditions

9. Disc spring guide sleeve

This design prevents the ball and upstream seat from popping out in the event of incorrect installation or reverse pressure.

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