Non-return valve

Item:Non-return valve

Short Description: Non-return valve means relying on the flow of the medium itself automatically open and close the valve, the valve to prevent the media back, also known as non-return valve, check valve, reflux valve, and back pressure valve. Check valves are an automatic valve, whose main role is to prevent the media back, to prevent the pump and drive motor reversal, and discharge the container medium. Pressure valve which can also be used to exceed the system pressure may rise auxiliary systems provide supply pipeline. Check valve can be divided into the swing check valve (depending on the focus of rotation) and lift check valves (axial movement).For 1.6 ~ 6.4MPa, piping various conditions operating temperature -29 ~ 550 ℃ of petroleum, chemical, fire station and the like. Applicable medium: water, oil, steam and so on.

Materials:Carbon Steel

Size/Dimension:DN15,DN20,DN25,DN32,DN40,DN65,DN65,DN80,DN100,DN125,DN150,DN200,DN250,DN300,DN450

Place of origin: China , Sell to worldwide.

Structure and Feature:

1, selected materials, in line with domestic and foreign standards, high overall quality of the material.
2, Sealing pair advanced and reasonable, the valve seat sealing surface using iron-based alloy or Stellite (Stellite) cobalt-based alloy cladding into the surface, wear-resistant, high temperature resistance, corrosion resistance, good anti-abrasion performance ,long lasting.
3, the product according to national standards GB / T12235 design and manufacturing.
4, can be a variety of standard pipe flanges and flange sealing types to meet various project needs and user requirements.
5, the full range of body materials, gaskets, according to the actual working conditions or user requirements reasonable matching can be applied to all kinds of pressure, temperature and medium conditions.
Users can design and manufacture different forms and connection forms a check valve structure for a variety of equipment for use.

Application :
The valves are used to prevent the media on Industrial valves, backflow devices.

Dimension and Parameter:
DN15,DN20,DN25,DN32,DN40,DN65,DN65,DN80,DN100,DN125,DN150,DN200,DN250,DN300,DN450…

Application Specifications

Main parts,materials and main uses

• The item  is available for retail and wholesale;
• The item is very heavy,usually,we suggest delivery by sea only for large DN.The place of origin is in China,when you buy one or two,please consider freight(by air or by sea) into the cost;
• Accept bulk order with Container delivery;
• Please contact us to email: sale@smartclima.com

1, the valve passages to be blocked at both ends, there is a dry and ventilated room. If long-term storage should always check the anti-rust.
2, the valve should be cleaned before installation, and eliminate defects caused during transport.
3, must be carefully checked when installing signs and nameplates on the valve meets the requirements.
4, vertical lift check valve should be installed in a vertical pipe.
5. The level of valve lift check valve should be installed in horizontal pipelines.
6. Do not check valve in the pipeline to withstand the weight of large non-return valve should be self-supporting, so that the impact of unmanaged system pressure.
7, check valve, flow direction should pay particular attention to the media, the media should be consistent with the direction of the normal flow direction indicated by the arrow on the valve body, otherwise it will cut off the normal flow of media. Bottom valve should be installed in the bottom of the pump suction piping.
8, the formula lift check valve should be installed in horizontal pipelines, vertical lift check valve and bottom valve is usually installed in a vertical pipeline and the medium flows from bottom to top.
9, when the check valve is closed, it will produce water hammer pressure in the pipeline, can cause serious damage to the valves, piping or equipment, especially for large mouth lines or high-pressure line, it should cause the check valve’s choice close attention.