Abstract: A valve closure device for a check valve can include a first valve member configured to rotate from an open position to a closed position; a second valve member configured to rotate from an open position of the second valve member to a closed position of the second valve member; and a hydraulic dampener coupled to each of the first valve member and the second valve member in each of the open position and the closed position of each of the first valve member and the second valve member, the hydraulic dampener configured to resist rotation of the first valve member towards the closed position of the first valve member and the second valve member towards the closed position of the second valve member.

Abstract: Described herein is an improved externally mounted pressure relief valve that is especially adapted for rail tank cars or other large closed containers that contain or transport fluids, including liquids and gases. The pressure relief valve comprises a plurality of spring assemblies, and each spring assembly contains a pre-determined number of spring leaves. Each spring assembly is coiled upon a corresponding spring drum, and each spring drum is penetrated by a corresponding spring drum bolt. The spring assemblies are preferably aligned in at least two horizontal planes that are parallel to each other and normal to the vertical length of a spring block. The spring block and sealing disk are mounted vertically over the valve seat and within the confines of vertically extending spring brackets.

Abstract: Systems and methods for controlling an exhaust gas fan system. The control system may control one or more components of the exhaust system to optimize system performance and improve energy efficiency. The control system may be designed to maintain a substantially constant pressure in the exhaust header and provide a substantially constant flow through the exhaust fans. The control system may include software and hardware that allow the control system to control one or more of: modulation of one or more by-pass dampers; adjustment of the nozzle outlet area; varying the speed of the fans; the number and staging of fans. By utilizing and controlling one or more of these functions, the amount of energy being used may be minimized/optimized.

Abstract: The present invention relates to a mechanical fuse to seal pipes upon unintended rupture. When a pressure difference between a first pressure and a second pressure in a pipe is below a pressure threshold, a first spring retains a flap in a first position allowing gaseous fuel to flow from a first portion to a second portion and when the pressure difference between the first pressure and the second pressure is not below the pressure threshold the flap moves to a second position preventing the gaseous fuel from flowing from the first portion to the second portion.

Abstract: The present invention relates to a mechanical fuse to seal pipes upon unintended rupture. When a pressure difference between a first pressure and a second pressure in a pipe is below a pressure threshold, a first spring retains a flap in a first position allowing gaseous fuel to flow from a first portion to a second portion and when the pressure difference between the first pressure and the second pressure is not below the pressure threshold the flap moves to a second position preventing the gaseous fuel from flowing from the first portion to the second portion.

Abstract: The present invention relates to a mechanical fuse to seal pipes upon unintended rupture. When a pressure difference between a first pressure and a second pressure in a pipe is below a pressure threshold, a first spring retains a flap in a first position allowing gaseous fuel to flow from a first portion to a second portion and when the pressure difference between the first pressure and the second pressure is not below the pressure threshold the flap moves to a second position preventing the gaseous fuel from flowing from the first portion to the second portion.

Abstract: The present invention is related to a liquid blocking apparatus and a system thereof, wherein if the liquid contained in an IV bag or a liquid tank is oozed out completely, the flow of liquid is blocked, the alarm lamp is turned on, the alarm sound is generated, and then the supply of liquid is maintained for a predetermined time.

Abstract: A fluid flow actuated valve for controlling the fluid flow in a conduit comprises a support structure adapted to be mounted within the conduit and at least one flap member pivotally mounted to the support structure. The at least one flap member is pivotable between an first position for a minimum fluid flow and a second position for a maximum fluid flow. A torsion spring is attached to the at least one flap member to urge the same to pivot against a fluid pressure differential, from the first position to the second position when the fluid pressure differential is smaller than a predetermined level.

Abstract: A pool cleaner reed valve for a pulsating submersible swimming pool cleaner which has a valve body (22) configured to fit into a pulsating valve enclosure. The body includes a rectangular inlet end (24) and an round outlet end (26) with a pair of fulcrum points (30) and restricting boundaries (32) for retaining and confining valve movements. A pair of opposed rigid valve plates (50) are angularly juxtaposed within the valve inlet end contiguously engaging the fulcrum points and respective restricting boundaries such that each opposed blade rotates inwardly on the fulcrum point until the distal ends intimately engage as influenced by negative fluid pressure applied by a pool pump. A pair of torsion springs (70) surround each restricting boundary and interface with each valve plate returning them to a parallel position when fluid pressure is terminated. A resilient sleeve (72) is positioned on each spring for eliminating a metal to metal contact with the spring to the valve plate.

Abstract: An improved valve for a pulsating submergible pool cleaner having a valve body (20) with an integral relief valve (32). The valve is dual acting and utilizes a pair of opposed laminated valve plates (50) with an outward bend (52) on one end and a right angle bend (54) on the other. When negative pressure is applied to the opposed plates, each plate draws together over a fulcrum (26) until the right angle bend touches a restrictive boundary in a cage (28) integral with the body creating the first step in the dual action. When negative pressure continues, the valve plates arcuately bow until the outward bends contiguously abut, closing the valve to fluid flow and creating the final step in the dual action. A garter spring (60) pulls the valves plates into their original parallel position when pressure is relieved.

Abstract: The present invention is directed to a multi-cuspid back-flow preventer in the nature of a check valve that has a generally annular body portion with axially spaced upstream and downstream ends. A substantially cylindrical passageway extends through the body portion, and a plurality of circumferentially adjacent valve cuspids are connected to the downstream end of the body portion for selectively opening and closing the passageway that extends therethrough. Each valve cuspid is marginated by a rib that extends into the passageway. Breather slots are provided between the successively adjacent valve cuspids, and a mounting flange may be provided at the upstream end of the body portion.

Abstract: Method and device for mounting a body in a conduit containing fluid. An installation unit is mounted on the fluid at that place, where the mounting of said body is desired, whereby sealing is established against the environment around an area, where a hole is going to be made in the surface of the conduit. The hole is made in the conduit in said area maintaining sealing against the environment. A body is inserted through the hole, so that the body will be placed in the conduit.

Abstract: A check valve having a body with a passage therethrough, a pair of vanes pivotally mounted within said passage so that they open and close flow therethrough responsive to flow in one direction, said vanes having an arcuate shape to create a smooth venturi passage between each vane and the opposed wall of the body so that the vanes open responsive to excess flows in the direction opposite to said one direction.

Abstract: A sampling nozzle is disclosed which includes an inlet valve that automatlly adjusts the opening thereof in predetermined inverse porportions to the pressures applied thereto by the fluid and/or other substances being sampled thereby. Whenever a constant pressure suction pump is effectively connected to the outlet thereof, isokinetic sampling is achieved within a system of varying velocities of the aforesaid fluid and/or other substances and, thus, a substantially fixed sampling rate is maintained with respect thereto.