The Dual Flapper Check Valve is a device used to prevent pressure or fluid from passing up through the
assembly. It is used in conjunction with a “TICX” or “TICR” Locking Mandrel. The Dual Flapper Check
Valve has two flapper assemblies with seals to prevent pressure of fluid bypass upwards.

The Dual Flapper Check Valve is a back pressure valve that allows the operator to pump through the assembly while allowing maximum flow through the assembly with minimal restriction.

Equalization can be achieved by placing an equalizing sub above the assembly, or by running a prong
attached to the pulling tool that will knock both flappers off seat..



  1 1/2" 2" 2 1/2"  
MAX. O.D. 1.328" 1.750" 2.156"  
O-RING (2) #116 #122 #128  
O-RING (2) #116 #215 #221  
TOP CONNECTION       1 1/8"-16      1 3/8"-14      1 3/4"-12       
BOTTOM CONNECTION       3/8" NPT 1/2" NPT 3/4" NPT  
FLOW AREA (SQ. IN.) .208" .374" .785"  



  1 1/2" 2" 2 1/2"
Part Number            21DUAL150      21DUAL187      21DUAL231     



  1 1/2" 2" 2 1/2"
Top Sub 21DUAL005 21DUAL001 21DUAL011
Bottom Sub 21DUAL006 21DUAL002 21DUAL012
Major Redress Kit 21DUAL007 21DUAL003     21DUAL013
Redress Kit 21DUAL008 21DUAL004 21DUAL014
Teflon Seat (optional) 21DUAL015-TEF      21DUAL020-TEF      21DUAL025-TEF