Pilot-operated fast shut-off valve

Pilot-operated fast shut-off valve

The pilot-operated shut-off valve adopts a cage-guided structure and a pressure unbalanced plug, making it suitable for shut-off applications with relatively high differential pressure. For high-temperature service conditions with extreme pressure differentials, the valve utilizes a specially designed double-plug pressure relief structure. This “flow to off” design works by first opening a small plug with low starting force; once opened, the pressure downstream is released, significantly reducing the differential pressure acting on the large plug. This sequence allows the large plug to be opened with relatively low actuator force while ensuring long-time stable running through hard alloy overlay welding on the plug and seat surfaces.

Key Features:

• Double-Plug Structure: Features a pilot-operated design where a small plug opens first to relieve pressure, facilitating the opening of the large plug with minimal force.
• High Differential Pressure Capability: Specifically engineered for shut-off applications under high differential pressure and high-temperature conditions.
• Enhanced Durability: Plug and seat surfaces are reinforced with hard alloy overlay welding to ensure long-term stable operation.
• Efficient Maintenance: Incorporates a quick disassembly type cage structure for easier servicing.
• Stable Guiding: Utilizes a cage-guided structure to maintain alignment and stability during operation.

Technical Specifications:

• Size: DN10-600 (3/8”-24”) or DN100-400 (4”-16”).
• Pressure Class: PN1.6, 4.0, 6.3Mpa (ANSI 150, 300, 600LB).
• Applicable Temperature Range: -196°C ~ 550°C.
• Body Type: Straight-through type or angle type.
• Bonnet Type: Standard, heat dissipation, cryogenic, or bellows type.
• Trim Features: Cage guided, unbalanced trim, quick disassembly type cage, and double-plug pilot-operated structure.
• Flow Characteristics: Quick open, equal percentage, or linear.
• Leakage Class: ASME B16.104 V (standard type metal seat).
• Pipe Connection: Flange type or butt welding type.
• Actuator Type: Pneumatic diaphragm actuator, pneumatic piston actuator, or electric actuator.

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