- Introduction
- Variation Type of Gate Valves
- Gate Valves Exploded View
- Gate Valve Working Principle Animation
What is a Gate Valve
A gate valve is a type of valve that is used to regulate the flow of fluid in a pipeline. It functions by raising or lowering a gate, which is a flat or wedge-shaped disk, inside the valve body to allow or prevent the flow of fluid. When the gate is fully raised, it creates an unobstructed passage for fluid to flow through the valve, and when it is lowered, it blocks the flow and shuts off the valve completely.
Gate valves are widely used in different industries, including oil and gas, water treatment, chemical processing, and HVAC systems, because of their ability to provide a tight seal and withstand high pressure. They are frequently favored for applications where the valve is either fully open or fully closed, as opposed to regulating flow like other types of valves such as globe valves or ball valves.
Gate valves come in various designs, including rising stem and non-rising stem configurations, and can be operated manually with a handwheel or automatically using actuators for remote control.
Variation Type of Gate Valve
1: Rising Stem Gate Valve: In this type, the stem rises as the valve is opened, providing a visual indication of the valve's position. This design is often preferred for applications where the valve's status needs to be easily determined.
2: Non-Rising Stem Gate Valve: In contrast to the rising stem design, the stem of a non-rising stem gate valve remains stationary as the valve is opened or closed. This type is often used in applications where space constraints or underground installation make a rising stem impractical.
3: Solid Wedge Gate Valve: This type features a solid gate with a wedge-shaped profile. Solid wedge gate valves are suitable for handling most fluids and are less prone to accumulation of debris or sediment compared to other designs.
4: Split Wedge Gate Valve: In a split wedge gate valve, the gate is split into two halves that can expand and contract slightly to improve sealing performance, especially in high-temperature applications where thermal expansion may occur.
5: Parallel Slide Gate Valve: Parallel slide gate valves have parallel gates that move linearly to control flow. This design offers excellent sealing performance and is often used in high-pressure and high-temperature applications.
6: Knife Gate Valve: Knife gate valves have a sharp-edged gate that cuts through fluids with minimal resistance when opening or closing. They are commonly used in applications involving thick or viscous fluids, such as wastewater treatment and pulp and paper industries.
7: Conduit Gate Valve: Also known as sluice gates, conduit gate valves are typically large and used to control the flow of water in channels, canals, or dams. They often have rectangular or trapezoidal gates that can be raised or lowered to regulate water levels.
These are just a few examples of the various types of gate valves available, each with its own advantages and suitability for different applications. The choice of gate valve type depends on factors such as the nature of the fluid, pressure and temperature conditions, and specific operational requirements.
Gate Valve Exploded View
| # | DESCRIPTION | QTY | MATERIAL | 2" | 3" | 4" |
|---|---|---|---|---|---|---|
| 1 | Hub Assembly | 1 | - | POR | POR | POR |
| 2 | Pin | 1 | - | POR | POR | POR |
| 3 | Grease Zerk | 1 | Alloy | POR | POR | POR |
| 4 | Lock Handle | 1 | - | POR | POR | POR |
| 5 | Screw Seal | 1 | - | POR | POR | POR |
| 6 | Bonnet Stud | 2 | - | POR | POR | POR |
| 7 | Screw Housing | 1 | - | POR | POR | POR |
| 8 | Stem Screw | 1 | Nickel Plated | VMVP2322 | VMVP2323 | VMVP2324 |
| 9 | Secondary Seal | 1 | Nitrile 70D | VMVP2415 | VMVP2420 | VMVP2430 |
| 10 | Retainer | 1 | - | POR | POR | POR |
| 11 | Stem Packing | 1 | Neo / Fab | VMVP2200 | VMVP2205 | VMVP2210 |
| 12 | Bonnet Stud Nut | 4 | - | POR | POR | POR |
| 13 | Screw Housing Stud | 8 | - | POR | POR | POR |
| 14 | Bonnet | 1 | - | POR | POR | POR |
| 15 | Stem | 1 | 303 SS | VMVP2300 | VMVP2305 | VMVP2310 |
| 16 | Gate (T-Slot) | 1 | Nickel Plated 316 SS | VMVP2100 VMVP2115 | VMVP2105 VMVP2120 | VMVP2110 VMVP2125 |
| 17 | Seat | 1 | BUNA-N | VMVP2000 | VMVP2005 | VMVP2010 |
| 18 | Bonnet Seal | 1 | Nitrile 70D | VMVP2350 | VMVP2355 | VMVP2360 |
| 19 | Bonnet Stud | 4 | - | POR | POR | POR |
| 20 | Body | 1 | - | POR | POR | POR |
Gate Valve Working Principle
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