摘要:
A positive displacement pump having a valve with an actuation guide for assisting its actuation. The valve may be configured for controlling fluid communication relative to a chamber of the pump with the valve actuation guide positioned external to the chamber and configured to assist in the controlling. The valve actuation guide itself may include an arm extending into a valve actuation assembly below the valve. In such embodiments, the arm may be reciprocated by crankshaft, hydraulic, or other means. Alternatively, the valve actuation assembly may include electromagnetic means for assisting in actuation of the valve.
摘要:
A high pressure valve assembly (10) comprising a valve sleeve (14) and a valve body (16) slidably mounted in the valve sleeve (14) is disclosed, the valve body (16) and valve sleeve (14) each having first ends (18, 56) and second ends (20, 58). A sidewall (22) extends between the valve sleeve first end (18) and second end (20) which sidewall (22) has an inner surface (24) and an outer surface (26) and at least one opening (30) therethrough. The sidewall (22) also includes at least one channel (40) having a first end (42) facing the inner surface (24) at a first location closer to the first valve sleeve end (18) than to the second valve sleeve end (20) and a second end (44) facing the inner surface (24) at a second location closer to the second valve sleeve end (20) than to the first valve sleeve end (18). A method of using the valve assembly (10) is also disclosed.
摘要:
A pneumatic actuator having AND gate logic characteristics is disclosed. The actuator has three chambers each divided into two chamber portions by respective flexible diaphragms. One of the diaphragms acts as a valve closing member and controls the flow of a pressurized fluid through the actuator to actuate an associated device when fluid flow is permitted. The other two diaphragms are in mechanical contact with one another and in hydraulic communication with the one diaphragm and thereby control its motion, keeping it normally closed and preventing fluid flow but allowing it to move into an open position permitting fluid flow and actuation of the associated device only when each of the two diaphragms are subject to separate, concurrent drops in pressure which allows both of them to deflect away from the one diaphragm.
摘要:
A discharge valve including a valve seat and a piston having a head with a bottom surface that is convex across its entirety for engaging the valve seat. The piston has a stem extending upwardly from the head away from the valve seat. A valve guide has a socket for slidably receiving the stem of the piston and a number of apertures intersecting the socket for providing pressure relief thereto. A compressed spring is disposed between the valve guide and the head for normally retaining said the in engagement with the valve seat.
摘要:
Embodiments of a low-pressure actuator, for use in a dry, low-pressure, pressurized gas, liquid fire control and suppression sprinkler system, with a pneumatic/electric double interlock mechanism, which requires that two separate events, such as discharging air pressure from the sprinkler system, and an electrical detection, must occur in order for the sprinkler check valve to be activated, thereby allowing water into the sprinkler system, are disclosed. In certain embodiments, a low-pressure actuator is utilized in series with a liquid flow valve equipped with a solenoid and an electrical detector/sensor for detecting an event such as the occurrence of smoke, heat, or a high rate of temperature rise. In alternative embodiments, the low-pressure actuator itself is equipped with the solenoid and detector/sensor.
摘要:
A pressure relief valve has a gasketed main body fastened to a vessel wall adjacent to a vent port, the body having a recess surrounding the port which receives a plastic insert removably coupled to the body by a retaining ring fastened to the main body. The insert defines a passage communicating with the port and a valve seat engageable by a seal assembly for closing the valve. The seal assembly includes an annular retainer for a seal O-ring and a plug receivable through the retainer and into a socket in a valve stem, which is spring-biased against the retainer and is guided in a guide assembly removably mounted on the main body. The insert is formed of plastic and the retainer and plug may also be formed of plastic and can be readily field-removable by simply unbolting the housing from the vessel and unfastening the retaining ring. The guide and bias assemblies need not be disassembled.
摘要:
An improved plastic valve body design and construction which has strength and durability similar to that of steel valve bodies but with significantly reduced manufacturing time and cost. The valve body comprises a unique and nonobvious combination of a previously unused plastic material and a complex rib design that results in performance similar to that of steel valves. The valve body is preferably comprised of Delrin or a nylon/Kevlar composite material. A plurality of ribbed members connect outer and inner faces of the valve body to provide increased strength and durability. The plastic valve body has the ability to deform to mate with the valve seat and thus extrusion gaps are eliminated. This allows use of more desirable softer polyurethane inserts.
摘要:
A pressure relief valve, for pressurized fluid storage vessels such as a rail tank car for volatile liquids, has a flap valve for rotational movement in a valve passage between a closed position seated on a valve seat and blocking the passage and an open position in which the passage is substantially unobstructed. A spring arrangement for keeping the valve closed against a rated pressure includes an externally mounted spring system which, when exposed to fire conditions which might threaten the wall strength of the vessel, loses spring temper so as to reduce the closing pressure of the valve. The flap valve is supported through an arm by a ball joint allowing a limited pivotal movement, and the valve seat is located in the valve passage by an O-ring allowing a limited degree of float in its own plane.
摘要:
A valve element is disclosed comprised of a body section, upper guide, lower guide, sealing section and reinforcement section. The reinforcement section is made of materials having a hardness greater than the lower guide and sealing section. The reinforcement section, as well as the sealing section, have a frustoconical outer surface to increase support of the sealing section due to bracing from a mating valve seat annular sealing surface. The frustoconical outer surfaces of the valve element combine to form a uniform frustoconical surface. Two sealing sections may be disposed above and below the reinforcement section. These two sealing sections have frustoconical outer surfaces that cooperate with the frustoconical surface of the reinforcement section to form a continuous, co-extensive frustoconical outer surface.
摘要:
There is disclosed a subsurface tubing safety valve of the type having a flapper swingable between an open position to one side of its bore and a closed position over a seat about its bore. A seal ring retained in a groove about the seat has a protruding lip which is initially engaged by the flapper as it is swung toward the seating surface of the seat.