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Do You Know The Functional Effect Of Different Check Valves?

Jul 03, 2019

 According to its structural characteristics, the check valve can be divided into wafer  check valve, lifting check valve,swing  check valve and so on.

  1. Wafer type check valve                                                                         (1)Compared with the swing check valve, the wafer check valve 1 has large flow resistance and is not suitable for the outlet of high pressure (Class900 and above) pumps and compressors.     (2) compared with the swing check valve, the flow resistance is large and should not be used in fluctuating medium conditions.                                                                 (3) compared with the swing check valve, the flow resistance is large, and it has the phenomenon of "targeting" and is not suitable for oxygen working condition.                     (4) because of the wafer connection structure, it is not suitable for large caliber (above DN600), high pressure (Class900 and above);                                                     (5) because of the spring aided reset structure, the spring stiffness and fracture pressure should be specially set for the working condition of low medium pressure;                       (6) should not be used for the condition of serious scour;                                     (7) as far as possible horizontal installation, when used in vertical pipeline, the flow direction of the medium should be guaranteed from bottom to top.Lift check valve 


(1) under the influence of the working principle, it can only be installed on the horizontal pipe.                                  

(2) compared with the rotating check valve, the flow resistance is large and should not be used for large diameter (dn50 and above), generally speaking, it is suitable for dn40 and smaller valves.

(3) the folded runner is not suitable for the working condition of pressure pulsation, it is not suitable for the working condition of high pressure oxygen medium, and it can not be used for the working condition with the requirement of passing ball.

(4) when the spring aided reset structure is used, it is not suitable for the working condition with low medium pressure, or specially set the spring stiffness to specify the crack pressure. (5) the flow channel is complex and the scour is serious, so it is not suitable for the medium condition containing solid particles.

3.Swing check valve 

(1) as far as possible horizontal installation, when used in vertical pipeline, we should ensure that the media flow direction is bottom-up;

(2) due to structural restrictions, it is not suitable for dn40 and below pipes;

(3) for large diameter pipes (such as dn400 and above), tilting rotary check valve should be adopted;

(4) for pressure or flow instability or fluctuating medium conditions, and valve diameter dn ≥ 200, tilting rotary check valve should be adopted.