A closed one-way valve is used to control the spray system of the bracket between the inlet port P and the outlet A: when pressing the opening port K1, water through the interface P can flow through the nozzle A; Instead, the hydraulic hole K2 closes to stop the water injection. The check valve is characterized by a jet flow of water and a liquid-controlled emulsion from two systems that do not interfere with each other. Injection and outlet directions of water YZK - 3 and ZPF13 can be inverted. Specifications Water supply pressure: 2 - 8 MPa Open pressure: 2 MPa Material: medium carbon / stainless steel / 1 Cr18Ni9