Valve structure with built-in valve seat of pre-action warning valve

A valve structure with a built-in valve seat of a pre-action warning valve, comprising:

• a valve body, a valve cap, a valve seat, and a membrane clack;
• wherein
• an accommodating cavity is provided in the valve body, and the accommodating cavity includes a water inlet, a water outlet, and a water flow through-hole for communicating the water inlet with the water outlet;
• the valve seat is embedded in the water flow through-hole;
• and an early warning channel is provided on the valve body;
• the membrane clack is disposed in the accommodating cavity and configured to control opening and closing of the water flow through-hole;
• a seal ring is disposed at the bottom of the membrane clack, and the seal ring abuts against the valve seat to form sealing to close the water flow through-hole;
• or the seal ring is separated from the valve seat to open the water flow through-hole;
• an upper surface of the valve seat is a sealing surface;
• early warning water flow through-holes are provided in the valve seat;
• and one opening of the early warning water flow through hole through-holes is provided on the sealing surface of the valve seat, and the other opening thereof communicates with the early warning channel;
• wherein a first annular groove is provided on the sealing surface, and the early warning water flow through-holes communicate with the first annular groove;
• wherein a second annular groove is provided on a side surface of the valve seat, and the second annular groove separately communicates with the early warning water flow through-holes and the early warning channel;
• wherein a fourth annular groove located above the second annular groove for installing a sealing ring is provided on a lower surface of an outer edge of the valve seat, so that the side surface of the valve seat and the lower surface of the outer edge of the valve seat abut against the valve body to form sealing, thereby enabling the second annular groove and the valve body to form a sealed channel.