Fluid circuit for work handling apparatus

Abstract

A fluid circuit for a work handling apparatus having a suction holder adapted to be selectively communicated with a vacuum source and a compressed air source, an having a first electromagnetic valve having first, second and third ports which are fluid-connected with the vacuum source, the compressed air source and the suction holder, respectively. The first electromagnetic valve is operable, when in a suction position, to communicate the first and third ports with each other and, when in a release position, to communicate said second and third ports with each other. The fluid circuit also has a first passage communicating the suction holder and the third port of the first electromagnetic valve with each other, a pressure sensor, a second electromagnetic valve operable to selectively establish and open a fluid circuit between the pressure sensor and the first passage. The fluid circuit is provided with a gas-liquid separating element disposed in the first passage for separating a liquid component, sucked into the suction holder and then into the first passage, from air. A parallel fluid circuit extends between the compressed air source and the second port of the first electromagnetic valve and including first and second flow regulators, and a switching valve is provided in the parallel fluid circuit for selectively connecting one or both of the first and second flow regulators into the parallel fluid circuit.