| 摘要 |
A fluid pressure regulator, for controlling the pressure of fluid in accordance with the pressure of an air signal, is characterized by a housing having a chamber divided into fluid and air chambers by at least two flexible diaphragms. The fluid chamber has a valved inlet for connection with a supply of fluid at an elevated pressure, and an outlet. The air chamber has an inlet for receiving an air signal at a selected pressure. A valve is moved by flexure of the diaphragms to open and close the fluid inlet, so that the pressure of the air signal regulates the pressure of fluid in the fluid chamber and at its outlet. A space is defined between the diaphragms, and vents extend from the space to exterior of the housing. Should the diaphragm on the fluid compartment side rupture, fluid entering the space will flow through the vents and provide a visible indication of diaphragm failure, but the diaphragm on the air chamber side will prevent fluid from entering that chamber. Should the diaphragm on the air chamber side rupture, air entering the space will flow through the vents and cause a whistling sound so audibly indicate diaphragm failure, but the diaphragm on the fluid chamber side will prevent fluid from entering the air chamber. If used to regulate the pressure of liquid coating material in an electrostatic spray coating system, the structure of the pressure regulator prevents it from storing a potentially dangerous electrical charge.
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