Self-contained hydraulic ESD system

Abstract

A hydraulic control circuit, comprising a control line connected to a device to be controlled by fluid pressure in the control line; a time-out valve on the control line, the time-out valve having a time-out period during which time-out period operation of the time-out valve is delayed after actuation of the time-out valve; a pump connected to the control line for pressurizing the control line with fluid; and an arming valve operated by pressure on an arming line connected to the control line and the arming valve being connected to the time-out valve to reduce the time-out period in response to pressure on the control line.

1 - 12 . (cancelled)  
   
   
       13 . A hydraulic control circuit, comprising: 
 a control line having an inner diameter; and    a restrictor on the control line, the restrictor comprising plural loops of continuous tubing arranged in plural layers, the tubing having a smaller inner diameter than the control line.    
   
   
       14 . The hydraulic control circuit of  claim 13  in which the layers are spirally wound.  
   
   
       15 . A hydraulic control circuit, comprising: 
 a control line connected to valve actuator;    a time-out valve on the control line, the time-out valve having a time-out period during which time-out period operation of the time-out valve is delayed after actuation of the time-out valve;    a pump connected to the control line for pressurizing the control line with fluid; and    an arming valve operated by pressure on an arming line connected to the control line and the arming valve being connected to the time-out valve to reduce the time-out period in response to pressure on the control line.    
   
   
       16 - 17 . (cancelled)