Products

Product Overview

The Electric Water Sealed Gate Valve (DSZ964H Series) is a highly specialized industrial flow control solution designed strictly for systems requiring absolute vacuum tight-isolation. It is widely utilized in the vacuum condensation systems of thermal power plants and petrochemical facilities where preventing atmospheric air from infiltrating the pipeline is critical to thermal efficiency and operational safety.

The valve features an engineered water-jacketed sealing structure built into the packing chamber, stuffing box, and bonnet joints. By introducing pressurized sealing water into these internal cavities, the valve establishes a dynamic dynamic water barrier. This ensures that even under high vacuum conditions, any potential micro-leakage pathways are completely blocked by the water seal, achieving zero gas leakage and maintaining optimum system vacuum. Equipped with a reliable electric actuator, it provides precise torque management and automated remote control for severe service plant automation.

Key Features & Technical Advantages

1. Engineered Vacuum Isolation Barrier

   The specialized dual-layer packing and internal water seal chamber create a highly reliable barrier against air ingress. This dynamic sealing technology is optimized specifically for turbine exhaust, condenser isolation, and negative-pressure pipeline services.

2. Extensive Size & Pressure Capacity

   With manufacturing capabilities ranging from DN50 to a massive DN4600mm, and nominal pressures from PN1.0 to 10.0 MPa, this series can handle everything from standard auxiliary lines to large-scale main cooling and vacuum intake manifolds.

3. Advanced High-Temperature Metallurgy

   Available in premium Carbon Steel (for services $\le\text{425°C}$) and high-grade Alloy Steel (for extreme services $\le\text{540°C}$). The body and bonnet feature uniform wall thickness and macro-defect-free structures to withstand severe thermal cycling.

4. Stellite™ Hard-Faced Sealing Pairs

   The valve seat and wedge sealing faces are overlay-welded with cobalt-based hard alloy (Stellite™), delivering exceptional resistance against high-temperature steam erosion, cavitation, scoring, and friction wear.

5. Flexible Wedge Design

   The flexible split-wedge configuration compensates automatically for pipeline pipe deflection and thermal distortion caused by extreme temperature fluctuations, ensuring consistent bidirectional shut-off without jamming.

6. Smart Automation & Safety Override

   The integrated electric actuator offers multi-turn precision, adjustable torque-limiting switches, and travel-limit protection. It includes a built-in manual handwheel override to guarantee safe emergency operation during a power failure.

7. Strict Multi-Stage Pressure Testing

   Fully compliant with GB/T 12234 and GB/T 13927 / JB/T 9092 standards. In addition to standard hydrostatic shell and seat tests, the water seal chamber undergoes independent high-pressure integrity testing to ensure seamless vacuum security before shipment.