Products

Product Overview

The ASME/JIS High-Temperature & High-Pressure Welded Gate Valve is an advanced engineering series designed in strict compliance with ANSI B16.34 and the Japanese power industry standard JIS E101. Featuring a bonnetless pressure self-tightening (Pressure Seal) design, the valve leverages internal line pressure to enhance seal integrity, delivering exceptional, bubble-tight sealing performance under severe high-temperature and high-pressure conditions.

The specialized pressure seal ring is available in two premium materials: low carbon steel or flexible graphite reinforced with SS316 wire mesh. To withstand severe erosion, the sealing faces are overlay-welded with a cobalt-based hard alloy (Stellite™), guaranteeing a post-machining pure metal layer of $\ge\text{3mm}$ for unmatched wear, thermal, and galling resistance. Engineered with secure butt-welded ends (with customizable bevel profiles), this heavy-duty valve is the premier choice for critical isolation of high-pressure water, superheated steam, oil products, and process fluids in thermal power plants, petrochemical facilities, and metallurgical piping systems.

Key Features & Technical Advantages

1. Versatile Manufacturing Processes (Forged & Cast Options)

   Available in both high-grade cast steel and heavy-duty forged steel body configurations. The casting/forging structures feature a smooth aesthetic finish and uniform microstructure, fully satisfying severe high-temperature and high-pressure project criteria. Full forged-steel series can be provided upon request.

2. Optimized Hardness Differential for Sealing Pairs

   The sealing faces are precision ground and polished to a mirror-like finish. The meticulously calculated hardness differential between the disc and seat maximizes wear resistance, prevents galling, and significantly extends the service life.

3. Integral Backseat Design

   An engineered backseat structure provides a secondary seal that protects the packing chamber when the valve is fully open, preventing stem leakage and allowing for safe maintenance under pressure.

4. Rigorous Multi-Stage NDT Quality Control

   Subjected to strict high-pressure hydrostatic shell tests, high-pressure gas testing, and comprehensive Non-Destructive Testing (NDT, including RT/UT/MT/PT). Every pressure-retaining component is thoroughly inspected to ensure flawless structural integrity.

5. Precision-Ground & Hardened Valve Stem

   The valve stem undergoes precise grinding and advanced surface hardening. This combined processing provides exceptional scratch and corrosion resistance while dramatically reducing friction torque for easier, smoother actuation.

6. Advanced Anti-Corrosive Packing System

   Utilizes a special corrosion-inhibiting packing structure capable of enduring extreme thermal and pressure stresses. Featuring self-lubricating properties, it minimizes stem friction, prevents localized stem pitting, and eliminates external fugitive emissions.

7. Bidirectional Pressure-Retaining Sealing

   Engineered with an advanced bidirectional sealing design, allowing the valve to maintain tight volumetric isolation regardless of the fluid flow direction, satisfying the most stringent criteria of severe service industrial applications.