| 摘要 |
<p>A inner chamber and valving cooperatively define a seating area and a sealing area for the valving. Both areas define boundaries between differential pressures of inner chamber high-pressure gas and outer chamber low-pressure gas. The valving equalises magnitudes of forces of such differential pressures. The forces are directed in balanced opposition, in the areas, equalisation of the forces and oppositely-directed balancing is maintained in the areas, regardless of how pressures of the inner chamber high-pressure gas and the outer chamber low-pressure gas vary. The body further admits and discharges a heating fluid in and from it. The fluid is heat exchanged with a portion of the body in which the areas and inner chamber are positioned. The heating fluid admitting and discharging device comprises porting formed in the body for conducting heating fluid into the body and discharging the heating fluid from the body. A bowl is removably fastened to the body in which to pool the heating fluid.</p> |
