Abstract: A valve disposed in a fluid system for cutting off the flow of fluid from a ource of that fluid to a fluid-using environment upon the occurrence of either an excess or unduly high fluid flow rate or an excess pressure condition experienced in or near the environment. An obturator, disposed in a flow chamber between the valve inlet and outlet, is controlled by two independent assemblies which are responsive to either the flow rate through the valve or the pressure downstream of the valve in the environment. A bias spring, part of a cutout obturator assembly and located in the obturator, maintains the obturator in an open position until an excess flow rate promotes a seating of the obturator. A spindle slidingly connects the obturator to a sensing piston assembly so that when an excess pressure condition is experienced in the environment the obturator is pulled into the seated position causing a cessation of fluid flow through the valve and an isolation of the environment from the fluid source.

Abstract: Automatic cutoff and tester apparatus of gas supply is shown which utilizes a diaphragm powered valve, a disk which closes an intermediate opening of a gas pipe, and a gas distributor plenum which is formed by the disk and a diaphragm, and sensor means having several levers and metallic weight which is normally attracted to a permanent magnet means. The gas distributor plenum is passed to gas pipe through bypasses in which a reset valve and a sensor valve of swing are arranged. The sensor means operates automatically in accordance with swing. The diaphragm powered valve cuts off the gas pipe by operation of the diaphragm in accordance with operation of the sensor means, when earthquake occurred.

Abstract: The scram valve has a closing piston which can be controlled by a pilot valve in a pressure medium supply line to the closing piston. The pilot valve has a control piston which is spring biased on one side and connected on the other side with the flow of medium in the outlet spigot of the scram valve. Thus, should the pressure in the outlet spigot drop, the control piston moves to open the pressure medium supply line to the closing piston. In addition, this supply line is connected at the upstream end to the scram valve casing upstream of the valve seat so that the pressure of the medium flowing through the scram valve aids in the closing of this valve.

Abstract: A displaceable frusto-conical channel is provided typically axially in-line in a housing, the housing being interposed in a fluid supply pipe, e.g. a water supply line. The truncated smaller end of the channel is downstream in terms of fluid flow. A ball is disposed in the channel so that a surge or high flow of fluid will move the ball downstream within the hollow channel until the ball constricts and stops fluid flow by contact with the inner wall of the channel. To complete the device, the upstream end of the channel is spring-loaded and a rod acts against the downstream end of the channel, typically in conjunction with a timer. When the timer is set, the rod holds the channel away from the tapered internal surface of the housing, to permit continuous fluid flow.

Abstract: A slam-shut valve or overpressure shutoff device used in series with, and upstream of, a pressure regulator to provide overpressure protection for apparatus downstream of the pressure regulator in the event of regulator failure. Overpressure or failure of the regulator automatically triggers operation of the slam-shut valve to close the same and prevent further passage of the gas through the pipeline. The slam-shut valve is normally in the open position, and the invention provides for manually resetting the slam-shut valve to reset it in the open position once it has been triggered closed.The valve element is carried on a lever which is pivotally mounted on a reset shaft and spring-biased to close, but prevented from closing by the latch which releasably holds the lever in the open position.

Abstract: A velocity flow control valve employed in a branch line between a main flow line and pressure responsive pilot valves in a safety system for closing a valve across the main flow line. The flow control valve has interfitting male and female body portions with the male body portion having a spring loaded ball urged upstream to an unseated position and is seated upon a pressure differential to block flow to the pilot valves from the main flow line upon a downstream drop in pressure. A ball bleed valve is positioned on the female body portion upstream of the spring loaded ball and may be opened to reduce fluid pressure between the spring loaded ball and the main flow line when desired.

Abstract: Apparatus for controlling the flow of fluid in pressurized lines; and for closing a valve and stopping said flow whenever downstream pressure drops below a predetermined value, is disclosed. The apparatus comprises a manually-operated valve for starting fluid flow and a spring-biased sequencing valve for stopping fluid flow, with fluid channels connecting the manual valve with the sequencing valve.