DN15 PN40 Swing Type Non Return Valve Horizontal Swing Type Check Valve For LNG

1. The valve disc of the cryogenic check valve is disc-shaped and rotates around the rotation axis of the valve seat channel. Because the channel inside the valve is streamlined, the flow resistance is smaller than that of the butterfly check valve, which is suitable for low flow rate and irregular flow.
It is suitable for large-diameter applications, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of the lifting type. Butterfly check valves are divided into three types: single, double and multiple. These three types are mainly divided by valve diameter. Its purpose is to prevent hydraulic shock when the medium stops flowing or flows backwards.

2. The cryogenic check disc is a check valve that slides along the vertical centerline of the valve body. The internal thread check valve can only be installed on the horizontal pipeline. On high-pressure small-diameter check valves, the disc can be spherical. The body shape of the butterfly valve is the same as that of the globe valve (it can be used together with the globe valve), so its coefficient of fluid resistance is relatively large.
Its structure is similar to the globe valve, and the valve body and disc are the same as the globe valve. The upper part of the valve disc and the lower part of the valve cover are processed with guide sleeves. The disc guide can be raised and lowered freely in the valve guide. When the medium flows, the valve disc is opened by the thrust of the medium. It falls on the valve seat to prevent the medium from flowing backward. The direction of the medium inlet and outlet passages of the straight-through butterfly check valve is perpendicular to the direction of the seat passage; the vertical lift check valve has the same medium inlet and outlet passage directions as the valve seat passage, and its flow resistance is smaller than that of the linear check valve. back.

3. Low temperature check valve: a check valve whose valve disc rotates around a pin in the valve seat. The disc check valve has a simple structure and can only be installed on horizontal pipelines, and has good sealing performance.

4. Low-temperature check valve: a valve whose valve disc slides along the center line of the valve body. Pipeline check valve is a new type of valve. Its small size, light weight, and good processing technology are one of the development directions of check valves. However, the coefficient of fluid resistance is slightly larger than that of the swing check valve.

5, compact check valve: This valve is used as a boiler feed water and steam shutoff valve, it has the integrated function of lifting check valve and globe valve or angle valve.

In addition, there are some check valves that are not suitable for the pump outlet installation, such as foot valve, spring type, Y type and other check valves.

The valve is used as a device for preventing the medium from flowing backward on industrial pipelines.

Notes When Use
 

1 . It should ensure that the pipe is blown clean before installation.

2 . When installing, make sure that the flow direction indicated by the arrow on the valve body should be consistent with the flow direction of the fluid.

3 . This valve has been degreased. Store and keep clean when installing.

4 . After the pipeline construction is completed, all the valves on the pipeline should be opened, and the residue in the pipeline should be thoroughly and thoroughly kept to ensure that the pipeline system is clean and free of debris.

5 . The installation system diagram with the oil-free requirements should be degreased.

6 . Slowly open and close during use.

7 . If the precision parts such as the valve disc, valve seat and valve stem are worn or damaged, it must be repaired and replaced in time.

8 . For parts such as gaskets and sealing materials, replace them with new ones each time.

Si Chuan Liangchuan Mechanical Equipment Co.,Ltd is a high-tech company specializing in the production of many kinds of valves,especially cryogenic valves.The main products are cryogenic valves,gate valves,globe valves,ball valves,butterfly valves, check valves,safety valves,etc.Our company has many national technology patents.And our company has established and improved the special equipment manufacturing management system and ISO 9001 international quality system and passed the certifications.In 2015,we have passed the certification of High Technology Enterprise.Liangchuan has established a strict and complete test organization, in order to ensure that the product quality is in line with relevant national standards,industry standards and corporation standards.

Q. Are there any special requirements for OEM purchases?
A. Yes. Liangchuan requires proof of trademark registration in order to print or emboss your trademark onto the product or packaging.
 

Q. Do Liangchuan products come with a warranty ?
A. Yes. That's why we offer 3-year product life guarantee, and a generous1 year warranty on all purchases that begins with the bill of loading.
 

Q . Do you support customization?

A . Yes, customization is acceptable.

Q . Can you advise suitable cryogenic valves to me?

A . We have more than 8 years experience in cryogenic field. We are professional in valve selection and will advise you suitable valves with detailed parameters and prices.

Q . How long is your delivery time?

A . It usually takes 5-30 days depending on the quantity of the order and the stock.