By-Pass Valve

Product Detail

By-Pass Vavle

During drilling operation, when well kick is taken place and bit bore is blocked. The by-pass valve can be opened to go fluid circulation and well killing .Before drilling in flow gas formation, the by –pass valve shall be located near or on the bit.
When take place well kick and pump pressure is too high or blocked, the following steps can be taken to open the by-pass valve :
● Discharge Kelly and drop in a steel ball (or a Nylon ball) which is carried by tool;
● Connect with Kelly;
● Put ball into retainer by pump circulation;
● When fluid is closed, the shear pin can be sheared off with adding 0.5~1.5Mpa pump pressure than original pump pressure;
● After pin is sheared, the seal sleeve move down to open the discharge hole and pump pressure come to drop down , then normal circulation and well killing operation can be started.
When ordering please specify:
● O.D. of body;
● Connection;
● Pump pressure to shear off pin if other than standard.










Specifications - By-pass Valve

Model	Product Code	O.D. (mm)	Seal sleeve (mm)	Top Connection (BOX)	Bottom connection	Pump Pressure of shear-off shear pin	O.D. of Steel ball (mm)
PTF105	F061053	105	32	NC31	NC31(PIN)	3-10MPa	35
PTF121A	F061213	121	38	NC38	NC38(PIN)	3-10MPa	45
PTF127	F061273	127	38	NC38	NC38(PIN)	3-10MPa	45
PTF127C	F061272	127	38	NC38	3 1/2 REG(BOX)	3-10MPa	45
PTF159	F061591	159	49	NC46	NC46(PIN)	3-10MPa	54
PTF159B	F061594	159	49	NC46	4 1/2 REG(BOX)	3-10MPa	54
PTF168	F061681	168	50.8	NC50	MC50(PIN)	3-10MPa	57
PTF203	F062031	203	62	6 5/8 REG	6 5/8 REG(PIN)	3-10MPa	65