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Check Valve

Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.

Check valves are generally installed in pipelines to prevent backflow. A check valve is basically a one-way valve, in which the flow can run freely one way, but if the flow turns, the valve will close to protect the piping, other valves, pumps etc.

What is a check valve used for?

Check valves are generally installed in pipelines to prevent backflow. A check valve is basically a one-way valve, in which the flow can run freely one way, but if the flow turns, the valve will close to protect the piping, other valves, pumps etc.

What is the difference between a backflow and a check valve?

Check valves use a hinged plug that allows water to pass through the pipeline but blocks it from coming back. Backflow preventers, on the other hand, apply an increased amount of pressure on a pipe to ensure the water can only flow one way.

Most common types of Check valves are swing, lift (piston and ball), butterfly, stop and tilting-disk.

Swing Check valve

A basic swing Check valve consists of a valve body, a bonnet, and a disk that is connected to a hinge. The disk swings away from the valve-seat to allow flow in the forward direction, and returns to valve-seat when upstream flow is stopped, to prevent backflow.

The disc in a swing type Check valve is unguided as it fully opens or closes. There are many disk and seat designs available, in order to meet the requirements of different applications. The valve allows full, unobstructed flow and automatically closes as pressure decreases. These valves are fully closed when flow reaches zero, in order to prevent backflow. Turbulence and pressure drop in the valve are very low.

swing check cameron

Lift Check valve

The seat design of a lift-Check valve is similar to a Globe valve. The disc is usually in the form of a piston or a ball.

Lift Check valves are particularly suitable for high-pressure service where velocity of flow is high. In lift Check valves, the disc is precisely guided and fits perfectly into the dashpot. Lift Check valves are suitable for installation in horizontal or vertical pipe-lines with upward flow.

Flow to lift Check valves must always enter below the seat. As the flow enters, the piston or ball is raised within guides from the seat by the pressure of the upward flow. When the flow stops or reverses, the piston or ball is forced onto the seat of the valve by both the backflow and gravity.

piston valve cameron

The Difference Between Backflow Preventers and Check Valves

It’s no secret that backflow is one of the most prevalent threats to the purity of our local water supply. Not only can contamination happen everywhere, but it can happen at any time if your plumbing system isn’t set up to prevent it. As such, business professionals, school administrators, and homeowners are all setting out to stop this occurrence and protect the quality of their drinking water. However, this process often comes with confusion regarding what equipment they should use for the job. This article covers the difference between backflow preventers and check valves.

Construction

Though backflow preventers and check valves have the same overall function, they both work slightly differently. Check valves use a hinged plug that allows water to pass through the pipeline but blocks it from coming back. Backflow preventers, on the other hand, apply an increased amount of pressure on a pipe to ensure the water can only flow one way.

Reliability

Backflow systems are generally more effective at keeping wastewater flowing in the correct manner because they’re highly pressurized. They also have several additional fail-safes that further protect our more sensitive drinking water sources. Check valves have a decent amount of reliability. However, they can fail under the right conditions and contaminate certain supplies with sewer water.

Applications

The increased reliability of backflow preventers makes them the preferred choice of anyone who needs to protect sources of drinking water, irrigation, or sprinkler systems. Check valves, then, are applicable in low-hazard situations for cross-contamination

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.

valve application natual gas pipeline

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.

valve application 01

Transport

valve application 02

Refinery

valve application 03

Thermal Power Plant

valve application 04

Steel Plant

valve application 05

Water Supply

valve application 06

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

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quality control nondestructive test 02
quality control nondestructive test 03

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

quality control cryogenic treatment 01
quality control cryogenic treatment 02
quality control cryogenic treatment 03

-196 ℃ Cryogenic Treatment System is a basic treatment for LNG usage valves or similiar applications.

Leakage Test

quality control leakage test 01
quality control leakage test 02
quality control leakage test 03

Leak testing is a procedure that inspectors use to determine whether an object or system is functioning within a specific leak limit.

Chemical Analysis

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quality control chemical analysis 02

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

quality control mechanical properties test 01
quality control mechanical properties test 02

All mechanical properties test will act before we use the materials to secure the performance and safety.

Heat Treatment

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quality control heat treatment 02

Up to 1200 ℃ electric furnance provide an availability of various heat treatment cycles.

Frequently Asked Questions

FAQ

How long is your delivery time?

The delivery time of customized products is generally 25 35 days, and non customized products are generally shipped within 24 hours after payment.

What are your payment terms?

T/T 30% as the deposit,The balance payment is paid in full before shipment

What is your minimum order quantity?

There is no minimum order quantity requirement. Customized products are tailor made according to the drawings provided by the customer.

Do you provide samples? Is it free?

If the value of the sample is low, we will provide it for free, but the freight needs to be paid by the customer. But for some high value samples, we need to charge a fee.

What is the packaging and transportation form?

Non steaming wooden box and iron frame packaging. Special packaging is available according to customer needs. The transportation is mainly by sea.

Inspections

As part of our quality regimen, 100% of incoming raw materials, semi-finished products, as well as finished products are thoroughly inspected prior to being entered into our inventory. We have established multiple hold points throughout fabrication as well as a comprehensive final inspection for all products.

Need to inquire about our products? Fill out the form below and our staff will be in touch!
Contact Form Demo

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
All of them have their particular uses, but these cover almost all the materials companies need to work on.

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.
application of rare earth alloy wear resistant pipe

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.