A gate valve is the most common valve for water supply systems. It represents a linear-motion isolation valve and has a function to stop or allow the flow. Gate valves got their name from the closure element sliding into the flow stream to provide shutoff and, therefore, acting like a gate.
What is a gate valve used for?
A gate valve is the most common valve for water supply systems. It represents a linear-motion isolation valve and has a function to stop or allow the flow. Gate valves got their name from the closure element sliding into the flow stream to provide shutoff and, therefore, acting like a gate. Gate valves are used to isolate specific areas of the water supply network during maintenance, repair works, new installations, as well as to reroute water flow throughout the pipeline.
Design & parts of a gate valve
A gate valve has a simple design and can be applied in many low pressure-drop services, which makes it one of the most common valves in use today. Gate valves are designed as full-port valves. This means that the valve port is of the same size as the inner diameter of the connecting pipe. Full-bore gate valve passes the fluid flow without any obstructions to a flow and do not cause a pressure drop in a pipeline. This also allows to clean the pipe using a cleaning pig.
A resilient seated gate valve with a non-rising spindle consists of the following parts:
- wedge
- ductile iron valve body
- seating area
- stem (spindle)
- spindle bearing
- bonnet
- packing.
The body is the largest element of the gate valve. Since the spindle remains in the valve body during rotation, it allows an economical bonnet construction. The valve bonnet itself is joined to the body with bolts, which allows cleaning and maintenance. As the gate valve closes, the wedge travels down until it presses the valve seat, which would mean a complete shutoff. During the opening the wedge slides towards the upper part of the valve body.
A wedge gate valve construction did not alter a lot for the last 100 years. However, the design of some elements of the gate valve has undergone some modifications. Most of the changes are aimed at increasing the service life of the gate valve, improving the sealing characteristics, using superior quality materials and epoxy coatings for a better corrosion protection. At the same time, the modern gate valve body has a compact sleek design, allowing installations in limited space conditions.
Parallel vs wedge-shaped gate valves
Gate valves can be divided into two main types: Parallel and wedge-shaped. The parallel gate valves use a flat gate between two parallel seats, and a popular type is the knife gate valve designed with a sharp edge on the bottom of the gate. The wedge-shaped gate valves use two inclined seats and a slightly mismatched inclined gate.
How does a gate valve work?
Gate valves are designed to turn the flow of a liquid on or off by restricting or opening the flow with a round or rectangular wedge. Gate Valves can also control the pressure of liquid flow through pipes or valves.
For custom size possibilities, please request a quote.
Valve Materials
We offer valves of various materials which can meet your needs on diverse occasions. Come get your valves right now!
Our Valves materials can be the following grade, another grade is also available on request.
Applications
Valves are found in virtually every industrial process, including water and sewage processing, mining, power generation, processing of oil, gas and petroleum, food manufacturing, chemical and plastic manufacturing and many other fields.
Transport
Refinery
Thermal Power Plant
Steel Plant
Water Supply
Natural Gas Pipeline
Quality Control
A valve can be described as a mechanism that controls the passage of liquids through a pipe. Research states that valves being manufactured in China are amongst the top valve competitors in the valve industry.
Nondestructive Test
Radiography Inspection guarantees no failures inside of the castings or forgings. Ultrasonic inspection acts an alternative of inspection. Dye penetrant testing and magnetic particle testing can examine surface failures on castings and forgings.
Cryogenic Treatment
-196 ℃ Cryogenic Treatment System is a basic treatment for LNG usage valves or similiar applications.
Leakage Test
Leak testing is a procedure that inspectors use to determine whether an object or system is functioning within a specific leak limit.
Chemical Analysis
All our materials are strictly made under supervision of ladle analysis instrument in the foundries and inspected by high precision spectroanalysis instrument when they arrive in our plant.
Mechanical Properties Test
All mechanical properties test will act before we use the materials to secure the performance and safety.
Heat Treatment
Up to 1200 ℃ electric furnance provide an availability of various heat treatment cycles.
Why Do I Need Wear Parts?
“Wear” is the last thing any business wants to experience with their machines. Apart from its unpleasant physicality, it could also be a sign that means your parts and/or components are about to break. You need wear parts to help prevent or prolong the wearing out of these parts and components – and that could be any type of wear parts such as pipes, liners, plates, etc.What Kinds of Wear Plates Do You Offer?
Here at Sunny Steel, we put emphasis to the primary kinds and types of wear pipes and fittings – they include:- Ceramic Liner pipes and fittings
- Ceramic tile lined pipes and fittings
- Ceramic sleeve lined pipes and fittings
- Cast basalt lined pipes and fittings
Merits and Salient Features
- Extremely High Resistant to Abrasion, Erosion and Corrosion.
- Resistant to most of the Chemicals, Alkalis and Acids.
- Very Long life
- Less Down time and Maintenance Cost.
Thermal power stations – raw coal chutes/ hoppers, feed bunker/coal bunker, ash pits, crushers, bottom ash, disposal slurry, dust lines/ bends, pipeline/bends, fly ash. Trenches below hopper and pipelines, pulverized coal piping.
Cement plants – dynamic air separators, raw mill ducts/ chutes, drag chain conveyor, grate cooler housing, air separator/ cyclones, coal handling, coal hopper/ chutes, cement conveying, slurry lines/ bends lines/ bends, discharge boxes / bankers, lime/silica hoppers/chutes, chain conveyor housing, mixers/nozzles, coal ventury.
Steel plants – coke sorting unit, coal bunkers / sinter bunkers, lime bunkers, coke breeze, sinter plant cyclones, sinter plant flow conveyors, iron slurry line, thick slurry lines, air lift pipes, telescopic pipes, granulated slag, hot mill flume.
Coal washeries – coal washing plants, coal transportation, conveyor chutes/pipes, floatation cells, media sumps, centrifuges, cyclones, sieves.