| 主权项 |
1. A two-stage switch valve comprising:
a valve body including a valve element having an outer circumferential edge slidably supported in a flow passage, and being subjected to a fluid pressure on an upstream side of the valve element in a flow direction of a fluid in the flow passage; and a spring urging the valve element upstream in the flow passage, wherein, when the fluid pressure on the upstream side of the valve element is higher than a predetermined pressure, the valve element moves downstream against an urging force of the spring to a predetermined downstream position where the fluid flows from the upstream side to a downstream side of the valve element through a communication hole that extends through the valve element, when the fluid pressure on the upstream side of the valve element is lower than or equal to the predetermined pressure, the valve element moves upstream by the urging force of the spring to a predetermined upstream position where the fluid flows from the upstream side to the downstream side of the valve element through the communication hole and with flowing on an outer periphery of the valve element to bypass the communication hole, and the valve body includes:
an upstream guide having a ring shape and being supported slidably in the flow passage, the upstream guide being located upstream of the valve element in the flow direction of the fluid; anda plurality of legs connecting the upstream guide and the valve element, the plurality of legs being inclined from an axial direction of the upstream guide, the plurality of legs extending from the upstream guide toward a center of the valve element. |
