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Polish Rod Clamp

By Expert Author: Joanna Smith

A multifunctional wellhead is suitable for oilfield development. It is including the design of the polished rod on the top of the wellhead sealing device, the adjusting device and polish rod clamp, below is nodes of the flange and the flange anti theft valve, sampler, one way valve on the nodes.

Flange nipple on the flange to the wellhead flange connection, the flange and the casing flange connection, the flange of nipple with internal tubing hanger, seat, seat seal on the flange of nipple sunken, on the upper flange in the short section of 180 degree level has two tubing exports, an outlet is equipped with anti theft valve, another outlet is equipped with anti-theft sampler, the part of the flange sub 180 degree level has two casing exports, an outlet is equipped with anti theft valve, another outlet is equipped with single valve.

Polished rod partial, polished rod break off the bop is cylindrical, the upper and the polished rod sealing device clamp connection, the lower end connected to the wellhead flange clamp, polished rod sealing device consists of two levels of concave seal of stuffing box. Adopting the above technical scheme of wellhead during workover treatment without disassembly process, ensure the wellhead oil not satisfy the need of oil well production, guard against theft system is more effective to prevent theft of crude oil.

A kind of multi functional wellhead, including of the polished rod on the top of the wellhead sealing device, the adjusting device and polished rod position bop, below is a short section of the flange and flange on the nipple in adapter spool, sampler, one-way valve, flange nipple on the flange and is characterized by wellhead flange connection, the flange with the method of casing under the LAN connection, the flange of nipple with internal tubing hanger, seat, seat seal on the flange nipple sunken stage, on the upper flange in the short section of degree level has two pipe exports, an export have anti-theft valve, another outlet is equipped with anti-theft sampler, the part of the flange sub 180 degree level has two casing exports, an outlet is equipped with anti-theft valve, another outlet is equipped with single valve.

Ring joint gasket can be used under the vacuum condition and more for high pressure vessel, tower and vessel, valve bonnet, etc. including high-temperature and high-pressure steam, oil, gas, solvent, etc.


There are oval type and octagonal type as its representative shape, which can be generally used for pressure of max. 350kgf/cm2 and there is BX type for more pressure. As for oval type and octagonal type, oval type has bigger flange groove deformation.

It is because gasket itself is deformed while bolt is extended until arriving to constant pressure by increased flange connection pressure and line contact is moved to surface contact as well. Therefore, it has good initial sealing performance but gasket is largely deformed.

When octagonal type is internally pressured, contact pressure with flange is increased, which is initially connected to surface contact. So it requests high connection pressure. But as for sealing characteristics, we can’t clearly say what type is better spacer spool. Generally, octagonal type is widely used. RX type can be used for flange groove of ring joint gasket but BX type can be only used with flange.

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