Function:
Check Valve is an automatic valve, its main function is to prevent the media backflow, prevent pump and drive motor reverse, and discharge the container medium. Check valve can also be used in pipelines that its pressure which may rise to exceed the system pressure auxiliary supply.

Classification:
According to its structure and installed methods Check valve can be divided into

1.Swing Check Valve: Swing check valve disc is cylindrical disk-shape, around the seat channel axis to do rotational movement, due to inner channel is the streamline, the flow resistance is smaller than the lift check valve, apply to the low flow rate and seldom flow changes large-caliber occasions, but it should not be used for pulsatile flow, its sealing performance is less than lift type. Swing Check Valve is devided into single disc, double disc, multi disc. These three types are mainly according to valve diameter, for the purpose to prevent the media stopping flow or reflux, reducing the hydraulic compact.

2.Lift Check Valve: disc slides along the body vertical axis, lift check valve can only be installed in horizontal pipelines, the high-pressure small-diameter check valve upper disc uses ball. Lift-type check valve body shape is the same with globe valve (commonly used to the globe valve), so its flow resistant coefficient is larger. its structure is similar to globe valves, body and disc are the same with globe valve. upper disc and lower bonnet have guided sleeve, the disc guided sleeve can freely lift, when the medium downstream, the disc opens by media thrust, when the media stopped-flow, the disc relies on self-vertical landing on the seat, affected as preventing media backwash. Straight-through lift check valve inlet and outlet media channel direction is perpendicular to seat channels; vertical lift-type check valve, its media inlet and outlet channel direction is the same with the valve seat passage, its flow resistance is smaller than the straight-through type.

Check valve is the valve relies on media flow to automatically open and close the disc, is used to prevent the media backflow, also known as check valve, one-way valve, reflux valve, and back pressure valve.

FAQ:
1. What is your term of payment?
A: T/T 30% as deposit, and 70% before delivery. We'll show you the photos of the products and packages before you pay the balance.
2. How about your delivery time?
A: It usually takes 15 to 30 days, which generally depends on the quantity of your order and our storage.
3. Can I get free samples?
A: Yes, send your address, your telephone number, post code, and express account number to us, and tell us which samples you need and samples specification.
4. Can you produce products with my own brand?
A: Yes, we can offer OEM services.

Our Company:
Ningbo Doway M&E Co., Ltd. is built in Ningbo China, which is established in 2000. We specialized in manufacturing brass & bronze valves and fittings, water meter accessories and pipe fittings. Our mainly products cover ball valves, angle valves, gate valves, check valves, bib cocks, marine valves, pipe fittings, PPR insert, radiator valves and fittings, camlock and grooved couplings etc.  

Nowadays, we are involving in the fields of brass forged, brass investment casting, bronze sand casting, brass/bronze gravity casting etc. Our products are widely used in water and plumbing systems and well recognized in Europe, USA, Middle East and Other Land with competitive price, quality products, and considerate service. Our company passed ISO9001 Certification and CE Approval for our ball valves, and UL approval for our bronze ball valves. 

Based on the Spirit "Honesty, Pragmatic, Innovation", we are proud to own one professional team and provided customers competitive prices, quality products with On Time Delivery. Also we have strong OEM and ODM ability for clients to supply various valves and fittings in brass & bronze material for water solution. 

Ningbo Doway M&E Co., Ltd is seeking to be the best cooperator for water plumbing and improve its worth to customers. Please contact us freely to know more details about what we can bring to your sourcing operation.

Flat disk Rotary Damper mainly used for large diameter, small height space. Disk dampers provide energy absorption and rotational deceleration. We offer many different models from mild to extreme. Our disk dampers are the perfect solution for a wide range of applications, from scanner, and glove boxes to auditorium seating to. Disk dampers are designed to control and smooth out the opening and closing of lids, and doors.

Our damper is conducive to performing structural movement in soft, silent and safe environment, mitigating impact load, avoiding strike damage, prolonging mechanical life, reducing noise disturbance, improving product quality and improve customer satisfaction.

NOTE:
1. Please contact the corresponding product engineer for specific torque products. 
2. Max. rotation speed: 50r/min
3. Max. circle rate: 6 cycle/min ( Clockwise360 °, 360 ° anti-clockwise for 1 cycle)
4. Operating temperature: -10~50℃
5. Storage temperature:-30~80℃

Applied torque:(T)
Test Temperature: 23+/-5℃
Rotating speed: 20r/min
Durability test Metho: Clockwise 360 °, 360 °anti-clockwise
Rotating speed: 20r/min
Test Frequency: (1cycle/min)
Test Temperature: 23±5℃
Durability test cycle: 50000 cycle
Test result criteria: Store in the room temperature for 24 hours or more after the test, recording to the torque T=T±30%T.

The damper square hole coordinateswith the rotation axis dimension tolerance.

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