Wedge Gate Valve

◇ Design

Tanggong gate valves are engineered and manufactured for maximum service life and reliability. All valves comply with international standards, including API 1600 & API 6D by the American Petroleum Institute, BS 1414 and BS EN1984 by British Standards, and ASME B16.34 by the American Society of Mechanical Engineers. Each valve consists of a fully assembled body, bonnet, and internal components.

◇ Range of Materials

Body and bonnet materials are available in nine grades covering carbon steel, low alloy steel, and stainless steel. For special service conditions, other grades of alloy and stainless steel can be selected. A wide variety of trim, packing, and gasket materials are available to accommodate different operating environments.

◇ Available Modifications for Trademark Cast Valves

• Trim modifications

• End connection changes

• Packing and gasket changes

• Operator mounting options

• Handwheel extensions

• Pressure equalization

• Bypass system integration

• Custom casting requirements

• Weld end bore customization (e.g., flange hole pattern)

• Oxygen and chlorine cleaning & packaging

Key Construction & Features

1. Operation
Large handwheels allow easier manual operation. Optional gear, electric, pneumatic, or hydraulic actuators are available for demanding applications.

2. Packing – Live Load Packing
Ideal for frequent cycling or varying pressure/temperature conditions. Live loading extends service life by maintaining compression with Belleville spring washers.

3. OS&Y – Outside Screw & Yoke
Provided for gate valves with flanged yoke structures (sizes: 150Lb–8″, 300Lb–8″, 600Lb–8″, 900Lb–4″ & below).

4. BB – Bolted Bonnet Connection
Bolted bonnet construction offers a secure pressure seal, especially under high pressure or temperature fluctuations.

5. End Connections
Available in flanged, RTJ flanged, or butt-welded end configurations for flexible pipeline integration.

6. Yoke Sleeve
For valves larger than 150Lb–12″, 300Lb–10″, 600Lb–6″, 900/1500Lb & 2500Lb–4″, extended yoke sleeves are equipped with thrust bearings for smooth operation.

7. Lantern Ring and Double Packing
Lantern rings with leak-off connections and dual packing stacks are optional for severe service applications.

8. Body-to-Bonnet Joint
Flat gaskets for 150Lb valves and ring-type gaskets for higher classes (300Lb to 900Lb) ensure robust sealing performance.

9. Stem – T-Head Design
Forged T-head stems enhance the stem-to-wedge connection strength and allow for self-aligning wedges, preventing stem jamming.

10. Wedge – Flexible Wedge Construction
Integral guide ribs ensure proper wedge alignment. Twin-disc designs (solid, split, or H-type) ensure independent flexing for superior sealing.