Metal-Seated Gate Valve with Bidirectional Zero-Leakage Sealing Full Metal Sealing Pair and High Temperature Stability for Guard Service

Product Overview

An industrial-grade valve engineered specifically for protection and isolation in critical process systems. Its primary mission is to provide an absolutely reliable shut-off point upstream or downstream of critical equipment (such as control valves, pumps, compressors, or metering instruments). Utilizing a full metal hard-seated sealing pair, it ensures long-term, stable, and bidirectional zero-leakage sealing under harsh conditions including high temperature, high pressure, corrosive media, or fluids containing particulates. When primary equipment requires maintenance or replacement, this valve can safely isolate that equipment from the system, thereby minimizing downtime and ensuring the safety and continuity of entire plant operations.

Core Design & Advantages

1. Engineered for Protection, Reliable Isolation

• Core Function Positioning: Designed specifically for isolation service, featuring robust construction and reliable operation to provide a fail-safe barrier during the maintenance of primary equipment.

• Enhanced System Availability: Allows for the maintenance of individual critical equipment without interrupting the overall process flow, significantly improving plant operational efficiency.

2. Hard-Alloy Sealing, Extreme Durability

• Full Metal Sealing Pair: The gate and seat sealing surfaces utilize hard materials such as Stellite overlay, tungsten carbide coating, or through-hardening treatment, offering exceptional wear resistance, galling resistance, and corrosion resistance.

• Adaptability to Harsh Conditions: Perfectly suited for high temperature, high pressure, high-velocity fluids, and media containing fine solid particles. Service life far exceeds that of soft-seated valves.

• High-Temperature Stability: Metal sealing materials do not decompose or degrade at high temperatures, ensuring long-term sealing integrity under thermal cycling conditions.

3. Robust Construction & Flexible Configuration

• Multiple Disc Designs: Available in rigid wedge or flexible wedge designs. The flexible wedge design better compensates for deformation caused by temperature fluctuations, providing superior sealing performance.

• Reliable Actuation: Standard configuration features an Outside Screw & Yoke (OS&Y) rising stem design, where the visual stem position allows for easy status confirmation. Optional handwheels, gear operators, or electric/pneumatic actuators are available.

• Extensive Material Selection: Key components like body, disc, and stem can be supplied in various materials per international standards such as ASTM and ASME, including carbon steel, stainless steel, duplex steel, Monel, and more.

Why Choose Our Hard-Sealed Guard Gate Valve?

We deliver more than just a valve; we provide a critical safety solution. Every valve is 100% pressure and seat tested prior to shipment against stringent standards such as API 598, ISO 5208, or MSS-SP-61, ensuring each unit is ready to perform its duty as a "safety guard" in your system. Our engineering team can recommend the optimal material combination and design based on your specific process conditions (pressure, temperature, media), achieving the lowest total cost of ownership.

Typical Application Scenarios

• Upstream Protection: Installed upstream of critical equipment like control valves, pressure reducing valves, or flow meters, serving as the primary isolation valve.

• Downstream Isolation: Installed at the outlet of pumps or compressors for equipment maintenance isolation.

• Critical Line Section Isolation: Used on process or utility lines requiring absolutely reliable shut-off.

• Industries: Widely used in oil & gas (upstream, midstream, downstream), petrochemicals, chemical processing, power generation (especially steam systems), metallurgy, and other industries with demanding service conditions.

Technical Specifications (Example)

• Valve Type: Metal Hard-Seated Gate Valve (Rigid/Flexible Wedge), Rising Stem or Non-Rising Stem

• Functional Role: Guard Valve / Isolation Valve

• Nominal Diameter: DN50 ~ DN400 (2" ~ 16") [Expandable upon request]

• Pressure Class: Class 150 ~ Class 1500 (PN16 ~ PN250)

• Operating Temperature: -196°C ~ +650°C (Depending on material selection)

• Body Material: WCB, LCB, WC6, WC9, CF8, CF8M, Duplex Steel, Other Alloys

• Seat/Seal Face Material: 13%Cr + Stellite, Stellite 6, Tungsten Carbide, or Other Hard Alloy Overlay

• End Connections: Flanged (ASME B16.5, EN 1092-1, AS 2129, etc.), Butt-Weld (ASME B16.25), Socket Weld

• Testing Standards: API 598, ISO 5208

• Design Standards: API 600, ASME B16.34