I involve in fire protection equipment industry more than 10 years. As insider in a fire fighting equipment export company, today, I will send this post and share related experiences with all readers. Gate valves are commonly used in hydrant applications as they provide a reliable and effective means of controlling the flow of water. There are several types of gate valves that can be used in hydrant applications, but the most common are the non-rising stem and the rising stem gate valves.
Two Types Of Hydrant Gate Valves
- The parallel gate valve uses a flat gate between two parallel seats. A popular type is the knife type, which has a sharp edge at the bottom of the gate.
- Wedge gate type adopts two inclined seats and a slightly mismatched inclined gate.
Non-rising stem gate valves are designed so that the stem does not move up and down as the valve is opened and closed. Instead, the gate moves up and down, allowing water to flow through the valve. This type of valve is often used in underground applications where space is limited, as the valve can be installed vertically.
Rising stem gate valves, on the other hand, have a stem that moves up and down as the valve is opened and closed. This type of valve is often used in above-ground applications, as the valve can be easily operated by turning the handwheel on top of the valve. Rising stem gate valves are also useful in situations where it is important to visually confirm whether the valve is open or closed.
Gate Valves Are Typically Used As Shutoff Valves To Control The Flow Of Water
In hydrant applications, gate valves are typically used as shutoff valves to control the flow of water to fire hydrants. They are installed on the main water supply line to the hydrant, and are designed to quickly and reliably shut off the flow of water in the event of an emergency. Gate valves for hydrant applications are typically made of durable materials such as cast iron or ductile iron, and are designed to withstand the high pressures and flow rates associated with fire protection systems.
List The Features Of Gate Valves For Hydrant Applications
Full Flow Capacity: Gate valves offer full flow capacity due to their large bore design, which allows for maximum water flow and minimal pressure drop.
Resilient Seating: Gate valves typically have resilient seating, which provides a tight seal to prevent leaks and ensures reliable shutoff.
Non-Rising Stem: The non-rising stem design of gate valves ensures that the valve can be operated easily without having to remove the operating nut or handle, making them suitable for use in hydrants where they are installed below the ground.
Corrosion Resistance: Gate valves for hydrant applications are often made of materials that resist corrosion, such as ductile iron or stainless steel, to ensure long-term durability and reliability.
Operating Nut or Handwheel: The operating nut or handwheel of gate valves provides easy and quick operation, even when the valve is buried under the ground.
High Operating Torque: Gate valves require a relatively high operating torque to open and close, which helps to prevent accidental opening or closing and ensures the valve remains in the desired position.
Tamper-Proof: Gate valves can be designed to be tamper-proof, preventing unauthorized or accidental operation.