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Description
JA3 series shear relief valve is composed of piston assembly, valve body, joint, shear pin plate and shield. When the mud pressure acts on the lower end surface of the valve body, the valve body receives an upward thrust, which is transmitted to the shear pin plate by the valve stem, so that the shear pins in the shear pin plate holes are sheared. When the thrust reaches the shear stress on the shear pin greater than the shear strength limit of the material of the shear pin, the shear pin is sheared. Through the different positions of the shear pins, the ultimate pressure values of different cylinder liners of the mud pump can be controlled