The side plates made of heavy steel provide a sufficient weight so that the wireline is kept taut when hoisting and lowering the empty elevator, which facilitates the drum to wrap the line, speeds up the lowering of the unloaded tackle and prolongs the line service life.
The sheave groove size and the contact surface radius

The chock manifold and the kill manifold are important well control equipment to carry out near balance drilling. During drilling, these equipment can keep reservoirs form pollution and control well blowout efficiently. The design and the manufacture of the manifolds conform to API standards. The valves can provide small