ASME B16.10 Stainless Steel Gate Valve CF8M API Trim 12 Cl150 RF Flanged Gate Valve

Types of Gate Valves

There are three ways to classify the gate valve.

1. Types of Disk

   1. Solid taper wedge

   2. Flexible wedge

   3. Split wedge or Parallel disks Valve

2. Types of Body Bonnet Joint

   1. Screwed Bonnet

   2. Bolted-Bonnet

   3. Welded-Bonnet

   4. Pressure-Seal Bonnet

3. Types of Stem movement

   1. Rising Stem or OS & Y Type (Outside Stem and Screw Type)

   2. Non-rising Stem type

Gate Valve Applications

• Gate valves are used in almost all fluid services such as air, fuel gas, feedwater, steam, lube oil, hydrocarbon, and all most any services.

• Some special gate valve is used in slurry and powder product also such as knife gate valve

Advantages of Gate Valve

• Gate valve provides good

• Pressure drop during operation is very less.

• Most of the gate valve can be used as bi-directional

• They are suitable for high pressure and temperature application and required less maintenance

Non-rising Stem Gate Valve or Insider Screw Valve

There is no upward movement of the stem in a non-rising stem type. The valve disk is threaded internally.

The disc travels along the stem like a nut when the stem is rotated. You can see the image. In this type of valve,

stem threads are exposed to the flow medium.

Therefore, this design is used where space is limited to allow linear stem movement, and the flow medium does

not cause erosion, corrosion, or wear and tear to stem material. This type of valve also known as an insider screw valve.