Patent ID: 9684315
Date: 2017-06-20
CPC Classifications: F16K,G05D

Claim:
1. A control valve for controlling a flow of fluid flowing from a primary port to a secondary port, the primary port and the secondary port being provided in a valve body, the control valve comprising: a poppet valve moving in an axial direction relative to a seat hole so as to change a flow-path cross-sectional area of the seat hole, the fluid flowing from the primary port to the secondary port through the seat hole; a return spring biasing the poppet valve in a valve closing direction; and an unitary body spring disc biasing the poppet valve in a valve opening direction against the return spring, wherein the unitary body spring disc includes: a secondary-pressure receiving surface being a portion moving along with a movement of the poppet valve, the secondary-pressure receiving surface configured to receive secondary pressure, the secondary pressure being introduced to the secondary port; and a pilot-pressure receiving surface formed on an other side of the secondary-pressure receiving surface, the pilot-pressure receiving surface configured to receive pilot pressure serving as a reference pressure, wherein the unitary body spring disc deforms elastically in accordance with a pressure difference between the secondary pressure and the pilot pressure to cause the poppet valve to move in the axial direction.