Gate Valves — Technical Overview & Selection Guide

Overview

Gate valves are linear-motion isolation valves designed to provide reliable on/off flow control in piping systems. They operate by raising or lowering a gate or wedge through the fluid passage. Gate valves are primarily used for fully open or fully closed service and are generally not recommended for throttling applications.

Key Features

• Reliable isolation and shut-off

• Full-bore flow passage with low pressure drop when fully open

• Suitable for liquid, gas, steam, and process services

• Suitable for high-pressure and high-temperature applications

• Available in rising stem and non-rising stem designs

• Outside Screw and Yoke (OS&Y) and inside screw configurations available

• Flanged and butt-weld end connections

• Available with wedge, parallel slide, or slab gate designs

• Suitable for a wide range of industrial and process applications

• Available in ASME Class 150–2500, as applicable

Common Gate Valve Types

• Wedge Gate Valve

• Solid Wedge Gate Valve

• Flexible Wedge Gate Valve

• Split Wedge Gate Valve

• Parallel Slide Gate Valve

• Slab Gate Valve

• Expanding Gate Valve

• Rising Stem Gate Valve

• Non-Rising Stem Gate Valve

Technical Selection Parameters

Selection should consider:

Materials

Common body materials include:

• Carbon Steel

• Stainless Steel

• Alloy Steel

• Cast Iron

• Ductile Iron, where applicable

Gate, stem, trim, and seat materials should be selected based on fluid compatibility, pressure, temperature, erosion, corrosion, and service requirements.

Trim & Seat

Trim and seat configurations may include:

• Stainless Steel Trim

• Alloy Trim

• Hardened Trim

• Metal-to-Metal Seats

• Resilient Seats, where applicable

• Stellite® or equivalent hard-facing, where specified

Material selection depends on process fluid, operating temperature, pressure, corrosion resistance, erosion resistance, and required service life.

End Connections

• Flanged

• Butt-Weld

• Threaded, where applicable

• Socket-Weld, where applicable

Operation

Gate valves may be operated using:

• Handwheel

• Gear Operator

• Pneumatic Actuator

• Electric Actuator

• Hydraulic Actuator, where applicable

The operating arrangement should be selected based on valve size, pressure, accessibility, operating frequency, and automation requirements.

Testing & Inspection

Depending on project specifications and applicable standards, gate valves may undergo:

• Shell/body pressure testing

• Seat leakage testing

• Backseat testing, where applicable

• Dimensional inspection

• PMI (Positive Material Identification)

• MTC verification

• NDE (Non-Destructive Examination)

• Visual and surface inspection

• Functional/operational testing

Quick Selection Guide

Flow Service: Confirm whether the valve is required primarily for isolation or shut-off service.

Fluid: Identify whether the service is liquid, gas, steam, or another process fluid.

Size: Specify DN/NPS based on piping size and required flow capacity.

Pressure: Provide operating and design pressure together with the applicable ASME pressure class.

Temperature: Specify operating and design temperature.

Valve Type: Select wedge, parallel slide, slab, expanding, or another suitable gate configuration according to service requirements.

Material: Select body, gate/wedge, stem, trim, and seat materials based on process conditions.

Operation: Specify manual, gear-operated, pneumatic, electric, or other actuation requirements.

Installation: Confirm horizontal or vertical installation requirements and accessibility for operation and maintenance.

Pressure Drop: Gate valves generally provide low pressure drop when fully open due to their unobstructed flow passage.

Shut-Off: Define the required isolation and seat leakage performance.

Connection: Specify flanged, butt-weld, threaded, or socket-weld connection as applicable.

Applications

Gate valves are commonly used in:

• Oil & Gas

• Refineries

• Petrochemical Plants

• Chemical Plants

• Power Plants

• Steam Systems

• Water Treatment

• Water & Wastewater Systems

• Pumping Systems

• Process Piping

• Pipelines

• Transmission Lines

• Utilities

• Industrial Plants

Engineering Inputs for RFQ — Industrial Valves

For technical enquiry and quotation, provide the following engineering inputs:

Valve Type • Manufacturer/Brand • Model • Valve Size • Nominal Bore (NB) • Pressure Class/Rating • End Connection • Valve Body Material • Bonnet Material • Trim Material • Disc/Ball/Gate Material • Stem Material • Seat Material • Seal/Gasket Material • Operating Fluid/Medium • Specific Gravity • Viscosity • Operating Pressure • Design Pressure • Differential Pressure • Operating Temperature • Design Temperature • Minimum/Normal/Maximum Flow • Flow Coefficient (Cv/Kv), Where Applicable • Leakage Class • Shut-off Requirements • Manual/Actuated Operation • Actuator Type • Actuator Sizing • Operating Torque • Supply Voltage • Control Signal • Fail-safe Position • Open/Close Time • Installation Orientation • Flow Direction • Face-to-Face Dimension • Applicable Design Standard • Testing & Inspection Requirements • Certification Requirements • Quantity • Required Delivery Schedule.

Manufacturer Brands

1. ZOLOTO — Industrial Valves

Brand: ZOLOTO
Website: www.zolotovalves.com

2. MARCK — Industrial Valves

Brand: MARCK
Manufacturer: Hawa Engineers Ltd.
Website: www.marckvalves.com

3. LEHRY — Industrial Valves and Instrumentation

Brand: LEHRY
Manufacturer: Lehry Instrumentation & Valves Pvt. Ltd.
Website: www.lehryvalves.com

4. UFLOW — Automation and Process Control Valves

Brand: UFLOW
Manufacturer: Uflow Automation India
Website: www.uflowvalve.com

5. V-TORK CONTROLS — Industrial Flow Control Valves

Brand: V-TORK CONTROLS
Website: www.vtorkcontrols.com

6. PENNANT — Steam Traps and Pipeline Accessories

Brand: PENNANT
Manufacturer: Pennant Engineering Pvt. Ltd.
Website: www.pennantcorp.com

Engineering Inputs for RFQ

For technical enquiry and quotation, provide:

Valve Type • Size • Pressure Class • Fluid • Flow Direction • Design Pressure • Design Temperature • Body Material • Gate/Wedge Material • Stem Material • Trim & Seat • End Connection • Operation/Actuation • Installation Orientation • Required Flow Rate • Face-to-Face Requirement • Testing & Inspection Requirements.