Oxygen stop valve features and advantages and disadvantages

Oxygen shut-off valves are forced-to-close valves, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface not to leak. When the medium enters valve 6 from below the oxygen cut-off valve disc, the resistance that the operating force needs to overcome is the friction force of the stem and the packing and the thrust generated by the pressure of the medium. The force of closing the valve is greater than the force of opening the valve. , so the diameter of the valve stem should be large, otherwise there will be stem bending failure. The features of the oxygen stop valve are as follows:

(1) The structure is simpler than the gate valve, making it easier to manufacture and maintain;

(2) The sealing surface is not easy to wear and scratch, and the sealing property is good. When the valve is opened and closed, there is no relative sliding between the valve flap and the sealing surface of the valve body, so the abrasion and abrasion are not serious, the sealing performance is good, and the service life is long;

(3) When the valve is opened and closed, the stroke of the valve is small, so the height of the stop valve is smaller than that of the gate valve, but the structure length is longer than that of the gate valve;

(4) The opening and closing torque is large, the opening and closing is more laborious, and the headmaster of the opening and closing time;

(5) The fluid resistance is large, because the media channel in the valve body is more tortuous, the fluid resistance is greater, and the power consumption is large;

(6) Medium flow direction Nominal pressure PN ≤ 16MPa, the general use of downstream, the media from the valve below the flow; nominal pressure PN ≥ 20MPa, the general use of countercurrent, medium flow from the valve above the flow. To increase the seal energy. When used, the cut-off valve medium can only flow in one direction and cannot change the flow direction;

(7) The valve flap is often eroded when fully open.

The oxygen shutoff valve has the following advantages:

1, simple structure, manufacturing and maintenance more convenient;

2, the work schedule is small, the opening and closing time is short;

3, good sealing, low friction between the sealing surface, long life.

The disadvantages of the oxygen stop valve are as follows:

1, the fluid resistance is large, the force required when opening and closing is larger;

2. It is not suitable for media with particles, large viscosity, and easy to coke;

3, poor regulation performance.