平衡止回阀用于阻止向下的流动，但允许向上的流动。这种由钢丝绳 收回的止回阀下入并坐放到具备F型或R型面的坐落接头中，用来测试油管，坐放液压封隔器，并在暂停气举装置时防止流体进入地层。 CS-BF型平衡止回阀坐放到F型坐落接头的顶部不过端台肩上。不过端台肩可阻止向下的移动， 但阀并未锁紧在短节中以阻止向上的移 动。止回阀在收回操作中靠移动打开大旁通口来保持平衡。CS-BR型平 衡止回阀用来安放到R型坐落接头的底部不过端台肩上。不过端台肩可阻 止向下的移动， 但阀并未锁紧在短节中以阻止向上的移动。止回阀在收 回操作中靠移动打开大旁通口来保持平衡。

主要特性

◎ 流通面积大； 

◎ 利用流体旁通来收回；

◎ 单趟起下安装和拆除； 

◎ 设计简单。

EQUALIZING CHECK VALVE

INTRODUCTION

The Equalizing Check Valves prevent downward flow while allowing upward flow through the device.  These wireline retrievable check valves are run and landed in components with Model F or R profiles.  They are utilized to test tubing, set hydraulic packers and prevent fluids from entering the formation  during intermitted gas lift installation. CS-FB Equalizing Check Valves are complete units (not flow control bottoms) that land on the top nogo shoulder of a Model F Landing Nipple. The no-go shoulder prevents downward movement, but  the valves are not locked into the nipple to prevent upward movement. The check valve is equalized  by shifting open large bypass ports during retrieval operations.  CS-RB Equalizing Check Valves are complete units (not flow control bottoms) that land on the bottom  no-go shoulder of a Model R Landing Nipple. The no-go shoulder prevents downward movement,  but the valves are not locked into the nipple to prevent upward movement. The check valve is  equalized by shifting open large bypass ports during retrieval operations.

FEATURES

◎ Large flow area; 

◎ Fluid bypass for retrieval; 

◎ Single-trip installation and removal; 

◎ Simple design.

Note: Other specification products are available.