Packing sealing structure of valve used by delay coking device and using method of packing sealing structure
A technology of delayed coking and packing sealing, applied in the direction of shaft sealing, valve device, valve details, etc., can solve the problems affecting normal production operation, uneven distribution of packing radial compression force, etc., to avoid cutting off high-temperature residual oil feed , reliable sealing and prolonging the service life
Inactive Publication Date: 2019-10-29
SINOPEC GUANGZHOU ENG +1
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Problems solved by technology
[0003] The purpose of the present invention is to provide a packing seal structure and its application method for valves used in delayed coking units, so as to solve the problem caused by the uneven distribution of packing radial compression force along the valve stem axial direction existing in the existing packing seal structure. Problems and problems affecting normal production operations when changing packing
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[0010] see figure 1 , The packing sealing structure of the valve used in the delayed coking unit of the present invention (referred to as the packing sealing structure) includes working packing 7, and the working packing 7 is arranged in the stuffing box, and is pressed by the gland 6. The stuffing box and the bonnet 3 are integrally structured, and the valve stem 11 passes through the central opening on the stuffing box and the bonnet 3 . The upper part of the valve rod 11 is connected to the valve actuator, and the lower part extends into the inner cavity of the valve body 1 and is connected with the valve core (not shown). The working packing 7 is divided into two sections along the axial direction of the valve stem 11, and a spring 8 is arranged between the two sections of working packing 7. A spare packing 10 and a spacer ring 5 are arranged between the working packing 7 and the closed end of the stuffing box, and the spacer ring 5 is located between the working packing ...
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The invention discloses a packing sealing structure of a valve used by a delay coking device and a using method of the packing sealing structure. The packing sealing structure comprises a working packing (7) arranged in a packing box, working packing is divided into two sections along the axial direction of a valve rod (11), and springs (8) are arranged between the two sections of working packing.A standby packing (10) and partition rings (5) are arranged between the working packing and closed ends of the packing box, and the partition rings are located between the working packing and the standby packing. The standby packing is divided into two sections along the axial direction of the valve rod, a liquid packing injection ring (12) is arranged between the two sections of the standby packing, and the liquid packing injection ring is connected to an outlet of a liquid packing injection channel (90). The valve rod penetrates through the center of the working packing, the standby packing, the partition rings and the liquid packing injection ring. The invention further discloses a using method of the packing sealing structure of the valve used by the delay coking device. The packing sealing structure can be mainly used in two-way valves and four-way valves in the oil refinery delay coking device.
Description
technical field [0001] The invention relates to a stuffing sealing structure of a valve used in a delayed coking unit and a using method thereof. Background technique [0002] In the delayed coking unit of the refinery, two two-way feed cut-off valves and one feed four-way valve are generally required to be installed at the feed position and the feed joint in front of every two coke towers to control the feed from the upstream. The high-temperature residual oil feed (temperature is generally 500-550°C) is switched on and off to make it alternately enter the two coke towers. In this way, when one coke tower is producing coke, the other coke tower is in the decoking state, so as to ensure the continuous production of the delayed coking unit. In addition, at the oil and gas outlets of every two coke towers, two two-way oil-gas isolation valves, two two-way oil-gas vent valves and one oil-gas ring valve are generally required to be installed. The above-mentioned two-way valve ...
Claims
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IPC IPC(8): F16K41/04F16K41/06
CPCF16K41/04F16K41/06
Inventor 张欣杨成炯张利张妍蔡文
Owner SINOPEC GUANGZHOU ENG