Patent ID: 9057446
Filing Date: 2015-06-16
Classification: F16K

Abstract:
1. A pressure control apparatus comprising: a body that forms a fluid passage, which conducts fluid, and a valve seat, which is located in the fluid passage; a valve portion that is displaceable relative to the valve seat in both of a valve-opening direction, which is away from the valve seat, and a valve-closing direction, which is toward the valve seat, to change a cross-sectional area of the fluid passage at a location between the valve seat and the valve portion, wherein the valve portion is urged in the valve-opening direction by the fluid located on an upstream side of the valve portion in the fluid passage; a pulling force generating device that generates a magnetic pulling force to urge the valve portion in the valve-closing direction through a rod that has one end portion, which is placed adjacent to the valve portion, and another end portion, which is opposite from the one end portion and is held by an armature, wherein: a first resilient member that generates a first resilient force to urge the valve portion in the valve-closing direction; and a second resilient member that generates a second resilient force against the first resilient force of the first resilient member, wherein: