GMP valve. Mainly used in high pure water or other distribution system of water point vertical tube which can effectively reduce pipeline deadleg. One valve is placed in a horizontal position to keep an angle of emptying, the other, a host valve, need be placed vertically. The outlet is a no bacterial breeding or process cross infection sample mouth when the valve opens. SAP valve. Mainly used in a horizontal pipeline system, host valve is placed in a horizontal position to maintain a certain self-emptying angle. The passage hole is in the lowest discharge point of the host valve waterway.