Emergency gas and electricity shutoff apparatus and control system

A valve, comprising:

• a housing having a gas inlet, a gas outlet and a gas passage therebetween;
• a gate mounted in said housing so as to be movable in a direction across the gas passage between open and closed positions, said gate including a first portion having an opening therein that is positioned across said gas passage in said open position and a second portion that is positioned
• across said gas passage in said closed position;
• an upstream seat mounted in said housing upstream of said gate, said upstream seat surrounding said gas passage and contacting said gate so as to form a seal between said housing and said gate on an upstream side of said gate;
• and
• a dowstream seat mounted in said housing downstream of said gate, said downstream seat surrounding said gas passage and contacting said gate so as to form a seal between said housing and said gate on a downstream side of said gate.

A valve comprising:

• a housing having a gas inlet, a gas outlet and a gas passage therebetween;
• a gate mounted in said housing so as to be movable in a direction across the gas passage between open and closed positions, said gate including a first portion having an opening therein that is positioned across said gas passage in said open position and a second portion that is positioned across said gas passage in said closed position;
• a spring positioned so as to bias said gate toward said closed position;
• and
• a release pin movable between one position in which said release pin prevents said spring from moving said gate toward said closed position and another position in which said release pin releases said spring and said gate so that said gate moves to said closed position under the biasing force of said spring.

A valve comprising:

• a housing having a gas inlet, a gas outlet and a gas passage therebetween;
• a gate mounted in said housing so as to be movable in a direction across the gas passage between open and closed positions, said gate including a first portion having an opening therein that is positioned across said gas passage in said open position and a second portion that is positioned across said gas passage in said closed position;
• a magnet mounted with said gate;
• and
• a solenoid actuator for moving said magnet so that said gate is movable between said open and closed positions.