초록 ▼

A leak detector includes an off-center mounted metering pin cooperating with a single cross-hole in a poppet valve to accommodate adjustment of the flow rate past the metering pin by rotating the poppet valve about its longitudinal axis. A flow director, cooperating with the poppet valve, directs al

A leak detector includes an off-center mounted metering pin cooperating with a single cross-hole in a poppet valve to accommodate adjustment of the flow rate past the metering pin by rotating the poppet valve about its longitudinal axis. A flow director, cooperating with the poppet valve, directs all flow into the leak detector directly into the line during initial flow into the leak detector. A piston, responsive to line pressure, is sized smaller in diameter than the poppet valve to cause the line pressure to increase rapidly and significantly during the leak sense mode and which size permits reduction in size and weight of the leak detector.

대표청구항 ▼

1. A leak detector for use with a pump pumping product from a storage tank through said leak detector into a line having an outlet at a product dispenser, said leak detector comprising in combination;a) a poppet valve having a passageway and at least one cross-hole in fluid communication with said p

1. A leak detector for use with a pump pumping product from a storage tank through said leak detector into a line having an outlet at a product dispenser, said leak detector comprising in combination;a) a poppet valve having a passageway and at least one cross-hole in fluid communication with said passageway; b) a metering pin cooperating with said poppet valve to meter flow through said at least one cross-hole into said passageway of said poppet valve as a function of the position of said poppet valve relative to said pin; c) a piston having an effective area less than the effective area of said poppet valve, said piston being axially translatable in response to return flow of product from the line to displace said poppet valve relative to said pin during flow of product into the line; and d) a spring for restraining displacement of said poppet valve in response to translation of said piston.