Advantage of Retainer less design over Retainer in Dual Plate Check Valve

Advantage of Retainer less Design over Retainer 

1.       In Dual Plate Check Valve Retainer Design, the center pin (Off which the disc rotate) and the limiter bar (which prevents the disc from hitting each other) need to be affixed in the valve body which results in a penetration through the body wall. In retainerless design, a sleeve is inserted into the inside of the body thus avoiding penetrating the body wall thus no hole to be made in the body resultant, no leakage after wards due to increase in size of hole from normal wear and tear.

2.       In Dual Plate Check Valve Retainer Design, hole is made to accommodate hinge pin/stop pin there is chances of leakage path in body in retainerless no changes as hinge pin /stop pin will supported by lock screw and pin holder inserted in cavity made in retainerless design to accommodate them inside the valve body.

3.       In Dual Plate Check Valve Retainer Design, stop pin/Hinge Pin can come out from the body from the hole were a s in retainerless design it is not possible.

4.       In Dual Plate Check Valve Retainer Design has limitations to be used upto 52 bars only were retainerless design is suitable to use in higher pressure rating like more than 600 bars.

5.       Retainerless design can with stand higher temperature and pressure conditions like in critical Hydrocarbon and Chemical processing applications, or any service where environmental safety or fire hazards are concerned were as in retainer design in higher temperature & pressure conditions there will be metal expansion in hole threaded area in the body could cause to hazardous issues of danger of reaction of fluid with the atmospheric air which can resultant lead to  fire hazards and leakage of poisonous gases in the environment due to leakage of inflammable and poisonous fluid & gases.

6.       In Dual Plate Check Valve Retainer Design in Flanged Model to accommodate retainer, a hole is puncture in the flanged which is not acceptable as per the standard API 594 and ANSI 16.5, were as in retainer less design there is no puncturing of hole in flanges hence design is acceptable as per the standard.