Bellows Gate Valve

Product Introduction

‌Bellows gate valve is a widely used type of valve. Its working principle is to make the sealing surface of the valve flap to that of the valve seat through the pressure of the valve stem,thereby preventing the medium from circulating. Bellows gate valve is suitable for medium-and-low pressure to high-pressure working conditions. It has the characteristics of low friction, durability, small opening height, easy manufacturing and convenient maintenance.

Product Advantages

1. Bellows gate valve usually adopt a double sealing structure of bellows and packing to ensure a leakage-free seal at the valve stem. This design is especially suitable for applications where valve stem sealing is strict, such as high vacuum environments and nuclear industry. Bellows are usually made of stainless steel or Inconel material, which is fatigue resistant and has a long service life‌.

2. The bellows gate valve has excellent sealing performance. It relies on the valve stem pressure to make the valve flap sealing surface and the valve seat sealing surface closely fit, thereby achieving a good sealing effect and preventing medium leakage‌. 

3. The bellows gate valve is fatigue-resistant. It is made of stainless steel or Inconel material, which has high fatigue resistance and service life. 

4. The bellows gate valve is wear-resistant and corrosion-resistant. The sealing surface of the valve is usually surfaced with Co-based cemented carbide, which has excellent wear resistance, corrosion resistance and friction resistance and has a long service life‌.  

5. Bellows gate valves mainly include bellows sealing gate valves, forged-steel bellows gate valves, and high-pressure bellows gate valves.

• Design Standard: API600 / API602 / DIN3352

• End Flange: ASME B16.5 / JIS B2220 / DIN 2543

• Face to Face: ASME B16.10 / JISB2002 / BS EN558-1

• Inspection and testing: API598

• Bellows gate valves are widely used in various fields, including industry, power plants, exhaust gas purification plants, natural gas, vacuum devices, hot water systems, refrigeration systems, heating equipment, and steam systems.‌In addition, it is often used in situations with strict requirements for valve stem sealing, such as high vacuum situations, to prevent the leakage of surface toxic substances or precious substances.

• The bellows gate valve uses the pressure of the valve stem to make the sealing surface of the valve flap and the sealing surface of the valve seat closely fit, thereby preventing the flow of medium. This design allows the valve to have less friction during opening and closing and a longer service life. Due to its structural characteristics, bellows gate valves are suitable for medium-and-low pressure to high-pressure pipeline systems, especially for occasions where frequent switching is required‌.

• The bellows gate valve has undergone strict quality control in material selection, manufacturing process and structural design. It has high reliability and durability, which can ensure the long-term and stable operation.‌

Bellows gate valve

1) Design Standard: API600.API602.API6D.DIN3356,GB/T12234

2) End Flange: ASME B16.5.DIN 2543,GB9113

3) Size: 1/2"-12"

4) Pressure: 150lb~300lb

5) Temperature: 425℃

6) Materials: Carbon steel,Stainless steel

7) Suitable Medium: Water,Oil,Gas,Steam

Q1: What is the sealing performance of the bellows gate valve?

A1:‌ A bellows gate valve ensure a zero leakage seal of the stem. It prevents the leakage of fluid medium through the double sealing structure of bellows and packing, and is especially suitable for pipelines with flammable, explosive, toxic and precious media. The bellows gate valve adopts bellows structure. The lower end of the stainless steel bellows is welded on the valve stem, and the other end is placed between the valve body and the valve cover to form a static seal. This design can effectively prevent the process fluid from eroding the valve stem‌.