Bellows Seal Gate Valve

In process systems where external stem leakage needs to be controlled, a bellows seal gate valve incorporates a flexible metallic bellows around the stem to provide an additional sealed barrier. Bellow Seal Gate Valve Suppliers in Algeria can provide this construction for applications where fugitive-emission control, high-temperature service and dependable isolation are important.

Key Features

• Metal Bellows Seal: Creates a sealed barrier around the stem.

• Reduced External Leakage: Limits the potential for process-fluid leakage through the stem area.

• Gate Isolation provides on/off isolation with the gate clear of the flow path when fully open.

• High-Temperature Suitability: Metallic bellows can be selected for elevated-temperature services.

• Fugitive-Emission Control is useful where external emissions need to be minimised.

• Manual or Actuated Operation: Can be configured according to valve size and operating requirements.

Technical Specifications

Materials & Components

• Body: ASTM A216 WCB / A352 LCB / A351 CF8M

• Gate: ASTM A216 WCB / A351 CF8M / F22

• Stem: ASTM A182 F6a / F304 / F316

• Bellows: 316L Stainless Steel / Alloy 625, depending on service

• Seat: F304 / F316 / Stellite Overlay

• Bonnet: ASTM A216 WCB / A351 CF8M

• Packing: Flexible Graphite

• Gasket: SS + Graphite Spiral-Wound / Graphite

• Bolting: Alloy Steel / Stainless Steel

Applications in Algeria

Bellows seal gate valves are suitable for oil and gas facilities in Hassi Messaoud and Hassi R'Mel, as well as refining and petrochemical plants in Arzew and Skikda. They can also be used in gas-processing, LNG, steam and chemical-process systems where reliable isolation and reduced stem emissions are important, particularly in services handling hazardous or volatile media. 

Standards

Applicable requirements may include API 600, EN 1984, ASME B16.34, ASME B16.10, ASME B16.5 and API 598. For specified fugitive-emission requirements, API 624 / ISO 15848-1 may apply. For H₂S-containing sour service, NACE MR0175 / ISO 15156 should be considered where applicable.