دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

abbr: a trademark name for an annular pressure-responsive valve for a DST string.

annular pressure relief valve. Used in reverse circulating to prevent pipe collapse.

annular pressure relief valve.

a pressure relief valve that opens when temperatures increases sufficiently to melt an activation linkage.

n: a pin shaped like a carpenters nail and placed in a pressure relief valve. When the pin shears, it opens the valve to relieve pressure inside a vessel. Even though the nail pin is shaped like a nail, a carpenters nail should never be substituted for a nail pin. See also shear pin.

n: a valve that opens at a preset pressure to relieve excessive pres- sures within a vessel or line. Also called a pop valve, relief valve, safety valve, or safety relief valve.

n: a valve that is preset to open when a certain limiting pressure is reached. Such valves are commonly installed on pipes, pumps, etc. sometimes called safety valves or pop-off valves.

a mechanical valve that opens at a preset pressure to relive pressure in a vessel.

pressure relief valve.

n: see pressure relief valve.

n: refer topop valve

a valve in a pressurized system that is set to open and relieve pressure at a certain pressure level.

n: 1. an automatic valve that opens or closes when an abnormal condition occurs (e.g., a pressure relief valve on a separator that opens if the pressure exceeds the set point, or the shutdown valve at the wellhead that closes if the line pressure becomes too high or too low). 2. a valve installed at the top of the drill stem to prevent flow out of the drill pipe if a kick occurs during tripping operations.

various. Generally used in describing a surface or subsurface safety valve.

n: a type of pressure relief valve in which excess pressure causes a shearing action on a pin to relieve pressure. See pressure relief valve.

n: a device used to control the rate of flow in a line to open or shut off a line completely, or to serve as an automatic or semi-automatic safety device. Those used extensively include the check valve, gate valve, globe valve, needle valve, plug valve, and pressure relief valve.

any of several valves: plug, gate, butterfly, needle, etc., used in oil field operations.