Type H Threaded Style BPV

The Type H back pressure valve is a threaded style BPV that incorporates internal running threads, external setting threads, and an internal stinger.
This style valve must be rotated in a set of mating threads until it seats.
The Type H BPV may not be set with wire line because it must be rotated to set. The Type H BPV is designed to hold pressure from the well bore below the valve. Cameron rates this valve to 20,000 psi working pressure (WP). The internal threads in the upper body are right hand (RH) running threads that are used in conjunction with the running tool and retrieval tool. The external threads are acme style left hand (LH) threads and match the thread profile inside the corresponding tubing hanger.

Two Way Check Valve (TWCV)

The Type H Two Way Check Valve is designed to plug the tubing in order to test the tree and to allow tubing pressure to bleed off before removing the plug. This style valve must be rotated in a set of mating threads until it seats. Cameron rates this valve to 15,000 psi. For 20,000 psi applications the HM style Two Way Check is to be utilized. Both TWCVs utilize a plunger which seals on an upper seat to isolated tubing pressure from the Xmas tree bore. A lower seat is used to seal off pressure from above the TWCV.
The internal threads in the upper body are right hand (RH) running threads that are used in conjunction with the running tool and retrieval tool.
The external threads are acme style left hand (LH) threads and match the thread profile inside the corresponding tubing hanger.