Abstract: An apparatus and methods of using the apparatus are disclosed. Preferably, the apparatus includes at least a fluid level detection portion communicating with a fulcrum that provides at least a first lobe and a second lobe, and a control portion responsive to the first lobe when the apparatus is operated in a first operating mode and responsive to the second lobe when the apparatus is operated in a second operating mode. The apparatus preferably further includes a counterbalance mechanism linked to the fluid level detection device, wherein the apparatus operates in the first mode when a first balance force is applied by the counterbalance mechanism to the fluid level detection device, and further operates in the second mode when a second balance force is applied by the counterbalance mechanism to the fluid level detection device.

Abstract: A snap pilot used to pneumatically energize and de-energize a control device, such as a valve. The pilot has two valves—one to admit pilot pressure, and one to exhaust pressure. The pilot incorporates valves having an elastomeric seal but maintaining the precision of metal to metal contact. In the preferred embodiment, the elastomeric seal is an O-ring placed in a groove, without adhesive, having only a small amount of deflection when the seat is closed, whereby simultaneous metal-to-metal and elastomer-to-metal contact is achieved.

Abstract: A snap pilot used to pneumatically energize and de-energize a control device, such as a valve. The pilot has two valves—one to admit pilot pressure, and one to exhaust pressure. The pilot incorporates valves having an elastomeric seal but maintaining the precision of metal to metal contact. In the preferred embodiment, the elastomeric seal is an O-ring placed in a groove, without adhesive, having only a small amount of deflection when the seat is closed, whereby simultaneous metal-to-metal and elastomer-to-metal contact is achieved.