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RD Safety Circulating Valve

RD safety Circulating Valve is mainly used to seal oil-gas layer when the formation test ends and carry on cycle operation. At the same time, the ball valve of RD relief circulating valve and test valves could trap some formation fluid samples. In downhole operation, this valve will not be closed again after being opened. As a relief valve, the tool can be operated at any one time during the testing progress to blank off the test string. If four circulating ports of RD relief circulating valve is blocked, the valve can be used one-time shut-in valve. Below is tow size of DST RD Safety Circulating Valve.

Technical parameter

Specifications/”	3-7/8”	5”
OD (mm)	99	127.5
Drift OD (mm)	45	57
Total length (mm)	1883	1847
Working pressure (Mpa)	70	70
Working temperature (°C)	-29~+177	-29~+177
Resistance to Tension (KN)	1147	2430
Internal Pressure Strength (Mpa)	107	132
Outer Pressure Resistance (Mpa)	90	123
Torque Strength (KN.m)	12	35
Binding Screw Thread	2-7/8”   CAS & 2-7/8” EU	3-7/8”CAS   & 3-1/2” IF