Pressure System
AssigneeHaskel Europe Ltd.
InventorsPeter W. Kaveney, Paul Harrison
Life of this patent
Estimating the term…
Abstract
A pressurising system for bolt tensioning, comprising: an inlet for receiving compressed gas; a fluid outlet for connection to a bolt tensioning device; a pump for pumping fluid for increasing the pressure at the fluid outlet, the pump being coupled to the inlet for being driven by compressed gas received at the inlet; a negative pressure generator coupled to the outlet for decreasing the pressure at the fluid outlet, the negative pressure generator being coupled to the inlet for being driven by compressed gas received at the inlet.
Claims23
A pressurising system for bolt tensioning, comprising:
- an inlet for receiving compressed gas;
- a fluid outlet for connection to a bolt tensioning device;
- a pump for pumping fluid for increasing the pressure at the fluid outlet, the pump being coupled to the inlet for being driven by compressed gas received at the inlet;
- a negative pressure generator coupled to the outlet for decreasing the pressure at the fluid outlet, the negative pressure generator being coupled to the inlet for being driven by compressed gas received at the inlet.
A pressurising system for bolt tensioning, comprising:
- an inlet for receiving compressed gas;
- a fluid outlet for connection to a bolt tensioning device;
- a fluid reservoir having a headspace;
- a pump for pumping fluid from the reservoir for increasing the pressure at the fluid outlet, the pump being coupled to the inlet for being driven by compressed gas received at the inlet;
- a negative pressure generator communicating with the headspace of the reservoir for decreasing the pressure at the fluid outlet by decreasing the pressure in the reservoir.
(canceled)
(canceled)
A method for bolt tensioning, comprising:
- applying a nut to the stem of the bolt;
- attaching a hydraulic bolt tensioner to the bolt;
- receiving compressed gas through an inlet of a pressure generator;
- connecting a bolt tensioning device to a fluid outlet of the pressure generator;
- pumping fluid using a pump to increase the pressure at the fluid outlet, the pump being coupled to the inlet for being driven by compressed gas received at the inlet, thereby tensioning the bolt by applying hydraulic pressure to the hydraulic bolt tensioner so as to cause it to act against the face, the hydraulic pressure being applied by conveying fluid from a fluid reservoir to the hydraulic bolt tensioner;
- advancing the nut along the stem of the bolt;
- relieving the action of the hydraulic bolt tensioner against the face by reducing the hydraulic pressure;
- and
- removing the hydraulic bolt tensioner from the bolt;
- wherein the step of relieving the action of the hydraulic bolt tensioner comprises coupling a negative pressure generator to the outlet for decreasing the pressure at the fluid outlet, the negative pressure generator being coupled to the inlet for being driven by compressed gas received at the inlet.
A method for tensioning a bolt extending through a face, the method comprising:
- applying a nut to the stem of the bolt;
- attaching a hydraulic bolt tensioner to the bolt;
- tensioning the bolt by applying hydraulic pressure to the hydraulic bolt tensioner so as to cause it to act against the face, the hydraulic pressure being applied by conveying fluid from a fluid reservoir to the hydraulic bolt tensioner;
- advancing the nut along the stem of the bolt;
- relieving the action of the hydraulic bolt tensioner against the face by reducing the hydraulic pressure;
- and
- removing the hydraulic bolt tensioner from the bolt;
- wherein the step of relieving the action of the hydraulic bolt tensioner against the face comprises applying a negative gas pressure to a headspace of the fluid reservoir.
Dependencies are inferred from the claim text.