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Design standard of duckbill valve

  • Release time: 02-14
  • Number of visits: 258 times
  • Column: Product knowledge
  • Editor: Dark maple
Introduction: The application range of rubber joint is very wide. The reinforced limited flexible rubber joint can bear great pressure and absorb axial or radial displacement. However, when the pressure of rubber joint is too high, the phenomenon of pull-out may appear. Limit device

      Rubber joint It can be used in a wide range of applications Rubber joint It can bear great pressure and absorb axial or radial displacement. However, when the pressure of rubber joint is too high, the phenomenon of pull-out may appear.

There are three types of limit devices: type A - the limit screw is fixed on the pipe flange; type B - the limit screw is welded on the pipe flange. The above two forms can limit the displacement of rubber joint within the range required by the user. Duckbill valve It is made of elastic neoprene and man-made fiber. It is similar to duck's beak, so it is called Duckbill valve Under the condition of no internal pressure, the outlet of duckbill closes under its own elastic action; with the increase of internal pressure, the outlet of duckbill increases gradually, so that the liquid can be discharged at high velocity. In the early design of duckbill valve, in order to match with ~ standard, the flange standard of duckbill valve with diameter below 800 was specified. The center distance of bolt hole and the outer diameter of flange in the national standard of 1.0MPa were taken into consideration, and the diameter of pipe above 800 (included) was referred to the national standard of 0.6MPa bolt hole center distance and flange outer diameter. Flexible rubber joint 》Engineering standard Hg / T 2289-2001《 Flexible rubber joint 》CJ / T 208-2005 design selection points: 1) if other standard or non-standard flange is adopted, another agreement shall be signed to specify the standard or provide drawings and relevant data, and the manufacturer can customize the production. 2) Flange bolt number, bolt hole diameter and bolt hole center circle diameter shall be in accordance with gb9119. 3) When ordering the rubber joint, the user must explain the working pressure, applicable medium, temperature, connection mode and other related elements, as well as the working environment status: whether there is strong light, heat source, ozone, sparks, and often encounter sharp tools.

The application range of rubber joint is very wide. The reinforced limited flexible rubber joint can bear great pressure and absorb axial or radial displacement. However, when the pressure of rubber joint is too high, the phenomenon of pull-out may appear. The duckbill valve produced by Shanghai Luoying can realize the function of positive outflow and reverse check of sewage, and the product quality meets the ~ standard.

Products with high sales volume

 Square duckbill valve

Square duckbill valve

Square duckbill valve can effectively prevent seawater and sediment invasion. seawater
 Built in duckbill valve

Built in duckbill valve

The built-in duckbill valve is used for sewage system, discharge system, dike discharge, and
 Clamp type duckbill valve

Clamp type duckbill valve

The clamp type duckbill valve is a special structure, which has a "duckbill" shape and a "positive" shape

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