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Eight-position shift pneumatic cylinder, 8P pneumatic valve, oilfield accessories
The eight-position shift cylinder is the primary actuating component for shifting in large workover rigs and other heavy-duty equipment during both operational and travel modes. The compressed air that drives the cylinder’s piston and the stop rings at each gear stage is supplied via the operation of the eight-position shift valve.
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Cylinder
The eight-position shift cylinder is the primary actuating component for shifting in large workover rigs and other heavy-duty equipment during both operational and travel modes. The compressed air that drives the cylinder’s piston and the stop rings at each gear stage is supplied via the operation of the eight-position shift valve.
In the pneumatic system composed of cylinders and shift valves, the shift valve serves as the control element, while the shift cylinder acts as the actuating element.
The structural principle of the shift cylinder is shown in the figure. Inside the cylinder there is a piston 14, which is equipped with six stop rings—11, 12, 13, 16, 17, and 18. Piston 14 is fixed to the piston rod 2, while stop rings 11, 12, and 13 are fitted over the pull rod and can slide along the piston rod 2. The large spring 6 and the small spring 7 press against the front spring seat 8; the stop-ring spring 10, together with the rear spring seat 8, presses stop ring 11 against the seat, ensuring that stop rings 11, 12, and 13 remain tightly in contact with piston 14. When no air pressure is applied to the interior of the shift cylinder, the combined action of the outer spring 6, the inner spring 7, and the stop-ring spring 10 maintains force equilibrium among stop rings 11, 12, and 13 and piston 14, keeping them stationary in the position shown in the figure. On the portion of the piston rod that extends out of the cylinder body, there are scale markings indicating the positions of the various gear ratios; thus, the current positions of the stop rings and the piston represent the neutral position of the shift cylinder.
Retaining rings 16 and 17 are fitted onto rod 20, while retainer 18 is fixed to rod 20. When no pneumatic pressure is applied—that is, when the shift cylinder is in neutral—they can assume any position within their respective ranges of motion.
The eight-position switching cylinder has eight inlet ports: 1A, 6A, 3A, 3, 2, 5, 3, 6, and 1. The locations and names of the inlet ports, as well as the corresponding positions where the input air pressure is applied, are shown in the figure.
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Large oilfield
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Railway
Drilling machine
Well workover rig
Well-logging machine
Oil Production Plant
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