the body determines the seal in the form of how to put in place in sphere. For the whole body structure characteristics, installed in Marine ball valve ball after sealing it makes use of support bracket remain in place. Most of the support frame with threaded screw people body, and can allow trace adjusting support frame in order to increase or decrease of sphere seal compression force. This structure makes the integrity of the seal and ball seal is flat Ze additional friction. In theory, the support frame should not be surrounded the entire gasket area on the surface of the body surface, and should share it with the valve body. If the support frame to control the whole mountain closure, the seal compression force will be affected by pipeline force. For uneven force of pipeline, they may produce non-uniform seal, in order to ensure uniform sealing rigor, often use varying widths between support frame and sealing filler piece.

a small amount of ball valve use two pieces of the structure of the body, which is the body is divided into two half, Very similar to open by the threshold of the body) In order to easy to assemble and use floating spheres. Main drawback is that when using this structure pipeline strength and process temperature will change the seal rigor. For all the body structure, joint between the two and a half of the body will produce another - Potential of the drainage channel.

for Marine ball valve ball face-to-face dimensions is according to the valve body assembly structure, while the size varies with the factory. Has yet to establish all factories comply with the standard of comprehensive, like a globe valve S75 ANSVISA standards. 15 or ANSI/ISA S75. 16. Because the ball valve face-to-face dimensions than thin screw valve leaf type body, but less than the cut-off valve, the valve can be installed under the same conditions between the two flanges. When there is high temperature or thermal cycling, a longer pipeline between the flange bolt will lead to reduce the compression force due to thermal expansion or cause leakage. Even in the case of medium temperature, larger valves [ 8in( DN200) Or more] The bolt elongation or after long time cause leakage. Will not be used in the structure without flange, flange or Marine ball valve can be used as a whole can be separated from the flange. Integral flange is a solid block of the structure of the whole, and can be separated from the flange of the low cost, Use the alloy valve body) When the pipe and valve flange does not adapt to relatively easy to install.

butterfly Industrial Valves of the stuffing box is almost the same. Similar to other packing box, packing box of the chamber is after finishing and have enough depth can hold all kinds of packing structure. Butterfly is often such, ball rotation 1/4 - At the bottom of the turn action does not need to packing group of shaft to wipe any process medium. The type of stuffing box including packing group, suitable interval sets and packing pressure (dong Used to transfer the force that press a flange of dong to packing) 。 Don't like a globe Industrial Valves structure, when the shaft in the sphere were normal direction on each side, in the industrial valve ball valve stuffing box open end does not need to set the upper guide or bearing. In some automatic rotating valve shaft is set in the actuators are transmitted in the guide bearing.

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