公开(公告)号：US06260822B1

公开(公告)日：2001-07-17

申请号：US09477251

申请日：2000-01-04

Applicant: D. Sudhir Puranik

Inventor： D. Sudhir Puranik

IPC: F16K302

CPC classification number: F16K3/0236

Abstract: A seat assembly including preferably telescoping seating elements for use between a gate and a pocket in a gate valve body are disclosed. A seal is provided between the telescoping seating elements that is axially moveable and acts to seal with one or more sloping surfaces disposed on the seating elements. A spring acts to bias the seal towards the sloping surfaces so as to provide an initial seal. The sloping surfaces prevent movement of the seal in one axial direction. As line pressure increases the seal will move against the sloping surfaces with increased force to maintain the seal between the line or valve bore and the bonnet of the valve. A reverse pressure differential across the seal that is greater than the biasing force will cause the seal element to move in the opposite axial direction and bleed off the pressure across it. The seal may be metallic or have metal core with a coating of substantially non-elastic, non-permeable, chemically inert material of the type that is resistant to well bore fluids and other chemicals as well as unaffected by substantial changes in temperature.

Abstract translation: 公开了一种座椅组件，其包括优选地在门阀体中的门和口袋之间使用的伸缩式座椅元件。 在可伸缩的座椅元件之间提供密封件，其可轴向移动并且用于与设置在座椅元件上的一个或多个倾斜表面密封。 弹簧用于将密封件朝向倾斜表面偏置，以便提供初始密封。 倾斜表面防止密封件沿一个轴向移动。 当管线压力增加时，密封件将以增加的力移动抵靠倾斜表面，以保持管线或阀孔与阀的阀盖之间的密封。 跨越密封件的反向压力差大于偏压力将导致密封元件在相反的轴向方向上移动并且泄漏其上的压力。 密封件可以是金属的或具有金属芯体，其具有基本上非弹性的，不可渗透的，化学惰性的材料，其耐井眼流体和其它化学物质以及不受实质温度变化的影响。