Performance and application of discharge valve


Easy to operate, open freely, flexible and reliable movement; The disc assembly and maintenance is simple, the sealing structure is reasonable, and the sealing ring replacement is convenient and practical. Structure: Mainly composed of valve body, disc, sealing ring, stem, support, valve gland, handwheel, flange, nut, positioning screw and other parts. This type of valve should generally be installed horizontally in the pipeline.

Discharge valve is mainly used for discharge, discharge, sampling and dead-free shutdown operations at the bottom of reactor, storage tank and other containers. The bottom flange of the valve is welded to the bottom of the tank and other containers, thus eliminating the usual residual phenomenon of process media at the outlet. Discharge valve according to the needs of the actual situation, the bottom structure design is flat bottom type, the valve body is V-shaped, and provides two kinds of lifting and falling working mode disc. The valve body cavity with erosion resistance, corrosion resistance of the seal ring, in the opening of the valve moment, can protect the valve body from being washed by the medium, corrosion, and special treatment of the seal ring, so that the surface hardness reaches HRC56-62, with high wear resistance, corrosion resistance function, disc seal according to the need of the cover are surfacing cemented carbide, seal pair using line seal, to ensure the reliability of the seal, And prevent scarring. At the same time take short stroke valve disc design.

The difference between upward and downward:

The upward discharge valve for the ball to rise to discharge, the lower developing valve for the ball to fall to discharge.

The upward discharge valve is general full bore, lower open type discharge valve is general reduced bore, install the reaction kettle end flange is larger. Disc switch direction is different: Upward discharge valve, as the name implies, opens the disc and lifts the upper reactor; downward discharge valve, as the name implies, opens the disc and lowers the valve chamber. For this reason, the flange level should be increased to increase the space of the valve chamber. The opening and closing stroke is different, and the installation size has small opening and closing stroke and small installation height of the upper and lower opening and closing valves. The installation height of the rotating rod structure is the smallest, and the plunger only rotates in the process of opening and closing. It determines the opening and closing position of the valve according to the opening and closing position indicator. Opening and closing torque upward discharge valve is open for the disc to move up the valve, the valve needs to overcome the medium force when opened, and the closing torque is larger when opened.

The downward type and plunger type discharge valve open the disc downward movement valve. When opened, the direction of movement is the same as the medium force, so the closing torque is smaller when opened.

Although the upward discharging valve and the downward discharging valve are very different, their common characteristics are the close distance between the valve seat and the end flange, less material retention, compact structure and superior sealing performance. They are used in the reaction pot of fine chemical industry, pharmaceutical industry and chemical industry, and can also be used in the medium transportation of fine and soft particles.

Post time: Apr-26-2023