Table of Contents
What is the function of a gate valve?
Gate valves are used when a straight-line flow of fluid and minimum flow restriction are needed. Gate valves use a sliding plate within the valve body to stop, limit, or permit full flow of fluids through the valve. The gate is usually wedge-shaped.
What is the difference between globe valve and butterfly valve?
The globe valve raises the stem when it opens or closes, meaning that the handwheel rotates and lifts along with the stem. For butterfly valve, disc-shaped butterfly plate in the body around its own axis rotation, so as to achieve the purpose of opening and closing or adjustment.
What is the difference between globe valve and ball valve?
The main difference between these two types is the way they close. A globe valve uses a plug (stem) that closes against the flow, and a ball valve has a gate (ball) that closes across the flow. Globe valves are good for regulating flow, whereas ball valves are better for on/off control without pressure drop.
What is the difference between gate valve and check valve?
Gate Valves, Globe Valves, and Check Valves all have the same application and operation. Gate valves and globe valves are not operated at all. One of the most important components for any system is the ability to prevent backflow in a line.
Why do gate valves fail?
The most common causes of gate valve failure are wear and corrosion. Gate valves tend to wear out over time. And corrosion can cause the disc to stick in either the open or closed position. When the handle is forced, the stem leading from the handle to the disc will often break, rendering the valve useless.
Can butterfly valves be used for isolation?
Butterfly valves offer true isolation and control capabilities in a single product. Designed for accurate flow and pressure control, they are ideal in applications where positive isolation is required.
What is ball check valve?
A Ball Check Valve is a simple and reliable valve with the only moving part to block the reverse flow, is a spherical ball. The full-ported valve seat is uniquely designed allowing the ball to seat leak-tight without getting wedge into the valve seat.
Are globe valves expensive?
Globe valves can be used to start, stop, and regulate flow. Globe valves generally seal better than gate valves and last longer. They are more expensive than similarly sized gate valves, but may be worth the extra expense in situations where throttling is needed.
Can globe valve be used for throttling?
Conventional Globe valves may be used for isolation and throttling services. Although these valves exhibit slightly higher pressure drops than straight=through valves (e.g., gate, plug, ball, etc.), they may be used where the pressure drop through the valve is not a controlling factor.
Which is better a ball valve or a gate valve?
Ball valves are more effective at forming a tight seal and have more reliability and longevity than gate valves, but tend to be more expensive. They are often used for shutoff and control applications. Because ball valves can open and close immediately, they are more likely than gate valves to cause water hammer.
Can I replace a gate valve with a ball valve?
If you already have a gate valve installed and have to replace it, you can certainly replace it with a ball valve. You will need a torch to heat up the parts and remove them. Turn the water off and drain it from the pipe and valve. You will want to open the valve as well.