Wedge Gate Valve


Wedge gate valve is a linear motion, multi-turn general service valve.

Gate valve Types as per Type of Closing Element

  • Parallel disk Gate Valve
  • Wedge Gate Valve

What is a Wedge Gate Valve?

ZECO wedge gate valve is one of the gate valve types. Wedge gate valves are named because the two sealing surfaces resemble wedges in the body. In general, the two wedge gate valve sealing surface and the Angle of the vertical center line of 2 ° 52 ‘, 3 ’30 °, 5 °, 8 °, and so on. Wedge gate valves can be divided into rising stem gate valve and non-rising stem gate valve according to the stem structure, and wedge gate valve and double disc gate valve according to the gate structure. ZECO is a professional gate valve manufacturer in China, with nearly 30 years of experience and history in the production of gate valves.

Types of Wedge Gate Valve

Solid Wedge Gate Valve

he solid, or single wedge gate valve is the most widely used and the lowest cost used-type in the process industry for oil, gas and air services. The purpose of the wedge shape is to introduce a high supplementary seating load. Solid-Wedge Gate Valve can be installed in any position, suitable for almost all fluids and practical for turbulent flow services.

In some situations, the valve cannot be reopened until the system temperature reheats the valve; this phenomenon is known as “Thermal blinding”. Wedge gate valves can be further described as inside screw or outside screw patterns. Solid wedge gate valves in waterworks industry are popular as Sluice valves.

Flexible Wedge Gate Valve

The flexible wedge is a one-piece solid disk with a cut around the perimeter. These cuts vary in size, shape, and depth. A shallow, narrow cut on the wedge perimeter gives less flexibility but retains strength. A cast-in recess or deeper and wider cut on the wedge perimeter gives more flexibility but compromises the strength.

This design improves seat alignment and offers better leak tightness. It also improved performance in situations where thermal binding possible. Flexible wedges Gate valves are used in steam systems.

Applications of Wedge Gate Valves

Suitable for general application as on/off and isolation valves, not recommended for throttling and/or regulating purposes. They have excellent resistance to earthquake, shocks, vibration, pressure & strokes and can be operated soundly between -196°C to 595°C.

Features of Wedge Gate Valve:

  • ZECO wedge gate valve adopts wedge type gate, because the Angle of the gate is wedge type with the vertical center line, it can be closed more and more tightly in the closing process, further ensuring the sealing effect;
  • ZECO wedge gate valve adopts lifting stem, which can visually see the opening or closing state of the valve from a distance and is easier to judge. The stem and gate are connected by t-groove, and the t-head of the stem is forged as a whole to ensure sufficient connection strength;
  • ZECO wedge gate valve is designed with a sealed design that allows replacement of the packing when fully open. This design ensures that the packing can be replaced online when it needs to be replaced if the packing is damaged, preventing personnel waste caused by disassembly of the valve;
  • ZECO wedge gate valve is designed with anti-collision protection on the flange surface when it leaves the factory, which can protect the convex surface connected with the pipe flange during transportation and prevent damage of the valve in collision.

Material of Wedge Gate Valve:

No Part Material
1 Body ASTM A216 WCB
2 Seat Ring ASTM A105 + 13Cr
3 Wedge ASTM A216 WCB + 13Cr
4 Stem ASTM A276 410
5 Bonnet Gasket Graphite + SS304
6 Bonnet Bolt ASTM A193 B7
7 Bonnet Nut ASTM A194 2H
8 Bonnet ASTM A216 WCB
9 Backseat ASTM A182 F6a
10 Stem Packing Reinforced Graphite
11 Handwheel KTH330-08

ZECO Wedge Gate Valve Licence & Approvals

API 600-0351 American Petroleum Institute
API 6D-1225 American Petroleum Institute
Fire Test Certificate API 6FA TUV SUD SERVICE GMBH

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