3 results about "Shuttle valve" patented technology

A multiple cylinder engine controls an air/fuel ratio accurately by improved detection of the fluctuations in a vacuum due to a change in the openings of throttle valves. The multiple cylinder engine includes a plurality of intake passages that independently feed intake air to cylinders; fuel injectors; throttle valves; a pressure sensor; and a fuel controller that controls fuel injection of each cylinder using the detected pressure. The multiple cylinder engine may further include a vacuum inlet passage having an inlet port opened into intake passages that introduces the pressure of the intake passages into the pressure sensor. The vacuum inlet passage preferably includes a throttle portion having a passage area of no more than one ninth that of the inlet port.

The invention provides a shuttle valve. The shuttle valve comprises a valve bush and a valve element movably arranged in the valve bush. A first frustum is arranged at the first end of the valve element, a first conical base used in cooperation with the first frustum is arranged in the valve bush, and the first frustum and the first conical base are in conical surface contact. An opening A and an opening B are at least formed in the valve bush, when oil flows in the opening A, the first frustum at one end of the valve element and the first conical base are in surface contact, and conical surface seal is formed. According to the shuttle valve of the structure, one end or the two ends of the valve element are arranged to be of a frustum structure, cooperation between the valve element and the valve bush is changed into conical surface cooperation from point cooperation and linear cooperation, the sealing effect and the sealing performance of the shuttle valve are greatly improved, the sealing stability is better, it can be achieved that no leakage is generated during work, or the leakage amount is extremely small, and the requirement that the leakage speed is within 5 drops per Min is met. In addition, the invention provides a hydraulic system comprising the shuttle valve and mechanical equipment.