초록 ▼

A shutoff valve installed on the discharge side of a pump to automatically shutoff hazardous liquid flow in the event of a rupture on the downstream side of the shutoff valve. The shutoff valve operates in response to a predetermined pressure drop across a valve and may also function to stop the dri

A shutoff valve installed on the discharge side of a pump to automatically shutoff hazardous liquid flow in the event of a rupture on the downstream side of the shutoff valve. The shutoff valve operates in response to a predetermined pressure drop across a valve and may also function to stop the driver of the pump and close the shutoff valve in response to excessive temperature conditions. Various installational arrangements may be provided in order to associate the shutoff valve with the hazardous fluid flow line.

대표청구항 ▼

A shutoff valve for installation in a fluid flow line for controlling flow in the flow line, said valve comprising a valve body having an opening therein defining a valve seat, a valve member movably mounted in said body for movement between a closed position in engagement with the seat and an open

A shutoff valve for installation in a fluid flow line for controlling flow in the flow line, said valve comprising a valve body having an opening therein defining a valve seat, a valve member movably mounted in said body for movement between a closed position in engagement with the seat and an open position spaced therefrom, said valve body including an inlet volume on one side of the valve seat and valve member and an outlet volume on the other side thereof, said valve body including a cavity movably receiving the valve member and defining a volume isolated from the inlet volume and outlet volume, means sealing the valve member to the cavity while permitting movement in relation to the valve seat, spring means biasing said valve member towards the valve seat to close the valve member when the pressure in the cavity is balanced with or greater than the pressure in the inlet volume, restrictive orifice means communicating the cavity with the inlet volume to equalize pressures therein and a passageway communicating the cavity with the outlet volume to reduce pressure in the cavity when pressure in the outlet volume reduces during normal flow of fluid from the outlet volume when the passageway is open thus causing the pressure of the inlet volume against the valve member to overcome the spring means and move the valve member to open position to enable flow through the valve, a manually operated valve means in said passageway in alignment with said valve member, and a temperature sensitive valve spaced from the valve means for interrupting communication between said cavity and said outlet volume to close the valve member if high temperature conditions occur, said heat sensitive valve being disposed adjacent the outlet volume to sense the temperature thereof.