What is Gate Valve?
A gate valve can be defined as a type of valve that used a gate or wedge type disk and the disk movesperpendicular to flow to start or stop the fluid flow in piping.
A gate valve is the most common type of valve used in any process plant. It is a linear motion valve used to start or stop fluid flow. In service, these valves are either in a fully open or fully closed position.
When the gate valve is fully open, the disk of a gate valve is completely removed from the flow. Therefore
virtually no resistance to flow. Due to this very little pressure drops when fluid passes through a gate valve.
To achieve proper sealing, when the valve is fully closed, 360° surface contact is required between disk and seats.
Gate valves should not be used for regulation or throttling of flow because accurate control is not possible.
The high velocity of the flow in the partially open valve may cause erosion of the disc and seating surfaces
and also creates vibration and noise.
FS-GTF Gate Valve, API603, CF8M Body and API Trim 12 (stellite overlay),
ANSI Class 150 RF flanges, ASME B16.10 face to face, bolted bonnet, handwheel operated.
Size: 2″ – 6″ (DN50 – DN150)
Options: WCB Body and alternative trims.
||CS / SS GATE VALVE - FL / BW
||BS EN ISO 10434 [BS 1414] / API 600 / API 602 / API 603/ASME B16.34
||40 DN to 400 DN [1 1/2” to 16”]
||[CS - ASTM A 216 Gr. WCB] [SS - ASTM A 351 Gr.CF8 / CF8M]
||AISI 410 / 304 / 316
|Seat / Wedge
||13% Cr. Steel / AISI 410 / 304 / 316
||Bolted Bonnet, OS & YT, HW & Gear operated
||ASME - Class 150 / 300 / 600
|Face to Face
||ASME B 16.10 / EN 558 -1 / API 6D
||ASME B16.5, CLASS 150 / 300 / 600
||BS EN 12266 - 1 [BS 6755-1] / API 598
||Lantern Ring / indicator & Locking Device/ Renewable Seat / Stellite Hard facing / Jacketed Provision / RTJ Flanges / By Pass Arrangement / Higher Sizes / Special MOC: Austenitic and Duplex Stainless Steels
Types of Gate Valves
There are three ways to classify the gate valve.
Types of Disk
Solid taper wedge
Split wedge or Parallel disks Valve
Types of Body Bonnet Joint
Types of Stem movement
Rising Stem or OS & Y Type (Outside Stem and Screw Type)
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.