Self-contained hydraulic ESD system
AssigneeArgus Machine Co. Ltd.
InventorJames Richard Ellett
Life of this patent
Estimating the term…
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.
Claims17
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.
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.
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..
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;
- 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;
- and
- a restrictor on the arming line to allow pressure build up in 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.
A hydraulic control circuit, comprising:
- a control line connected to a valve actuator;
- a high-low pilot connected to the control line and a flow line, the high-low pilot being operable to control flow in the control line as a result of sensing pressure in the flow line being in a pre-set range;
- a time-out valve on the control line between the actuator and the high-low pilot, 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;
- 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;
- and
- a restrictor on the arming line to allow pressure build up in 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;
- whereby, when the high-low pilot shuts before the time out period expires, the arming valve disables the time-out valve and immediately puts the high-low pilot in control of the actuator.
Dependencies are inferred from the claim text.