Gate Valve / Knife Gate Valve, Ductile Iron, Wafer, Pneumatic Actuated, Through-Conduit Structure, Slurry/Pulp, MSS SP-81 Standard

Product Description

Gate Valve Introduction

PRODUCT INTRODUCTION

A gate valve is a commonly used stop valve in industrial pipelines. It controls the full opening or full closing of the pipeline by lifting the gate perpendicular to the direction of medium flow, and is generally not used for throttling regulation.

The sealing surfaces of gate valves are mostly flat or wedge-shaped. When opening and closing, the gate slides relative to the sealing surface of the seat. With a simple structure and low flow resistance, gate valves are the mainstream choice for large-diameter, long-distance transmission pipelines.

TECHNICAL SPECIFICATIONS

 Nominal Diameter (DN): DN15 ~ DN1400

 Nominal Pressure (PN): PN1.0, 1.6, 2.5, 4.0, 6.4, 10.0, 16.0 MPa

 Working Temperature: -29 ~ 550 (depending on material)

 Applicable Media: Water, oil products, steam, natural gas, weakly corrosive media, etc.

 Sealing Level: Soft-seated up to Class VI; Hard-seated up to Class IV~V

 Flow Resistance Coefficient: 0.08~0.12 (extremely low in fully open condition)

MAIN COMPONENT MATERIALS

Body / Bonnet

 Gray cast iron HT200: Suitable for low-pressure water and sewage applications.

 Ductile iron QT450-10: Municipal water supply and HVAC systems.

 Carbon steel WCB/A105: Steam, oil products, and medium-to-high pressure conditions.

 Stainless steel CF8 (304), CF8M (316): Chemical, acid/alkali, and seawater corrosion environments.

Gate / Seat

 2Cr13, 304, 316

 Sealing surface overlaid with Stellite alloy or copper alloy to enhance wear resistance and sealing performance.

Stem

 2Cr13, 304, 316 stainless steel, surface nitrided for anti-wear and anti-galling properties.

Sealing Forms

 Soft-seated: EPDM, NBR, PTFE. Suitable for normal temperature, low pressure, and zero leakage applications.

 Hard-seated: Hard alloy, stainless steel. Suitable for high temperature, high pressure, and wear-resistant conditions.

GATE VALVE CLASSIFICATIONS

1. By Stem Structure

 Rising Stem Gate Valve: The stem thread is exposed, allowing direct observation of valve opening. Easy lubrication and maintenance, less prone to medium corrosion. Suitable for outdoor and corrosive medium pipelines.

 Non-Rising Stem Gate Valve: The stem thread is built inside the valve body, saving space, dustproof and moisture-proof. Commonly used in underground pipe networks and space-limited applications.

2. By Gate Structure

 Wedge Gate Valve: The gate is wedge-shaped with good sealing performance, including elastic gate and rigid wedge gate. The most common structure.

 Parallel Gate Valve: The gate and seat have parallel sealing surfaces. Simple structure, fast opening/closing speed, suitable for medium-low pressure and large-diameter conditions.

3. By Connection Type

 Flanged Gate Valve: Easy installation and removal, reliable sealing, wide range of applications.

 Welded Gate Valve: Suitable for high temperature, high pressure, flammable and explosive media with no leakage risk.

 Threaded Gate Valve: Mostly used for small-diameter, low-pressure pipelines with compact installation.

4. By Actuation Type

 Manual Gate Valve: Handwheel or wrench operated, commonly used for small diameters.

 Gear Operated Gate Valve: Bevel gear drive to reduce opening/closing torque.

 Electric Gate Valve: Electric actuator driven, supporting remote automatic control.

 Pneumatic Gate Valve: Air source driven, suitable for explosion-proof and fast opening/closing scenarios.

PRODUCT FEATURES

 Low fluid resistance: Straight-through flow path when fully open, resulting in minimal pressure loss.

 Bidirectional flow with no installation direction restrictions.

 Low operating torque, suitable for large-diameter pipelines.

 Excellent sealing performance and long service life.

 Simple structure and convenient maintenance.