Safety Discharge Valve

A safety discharge valve, comprising a siphon-type open/close device (1), a valve cover assembly (2), a valve rod (3), a valve body (4), an extensible side-sealing top-pressing assembly (5), side rotary sealing plates (6), a tapered bottom valve plug (7), and a side water inlet emergency plug (10);

• wherein, the siphon-type open/close device (1) is connected to the upper part of an open/close nut (8) on the valve cover assembly (2) through an inserted sealing connection;
• the top of the valve rod (3) is slidably connected with the center of the valve cover assembly (2) and is sealed inside a sealed valve rod cavity (62), below the bottom of the piston (24) and above a sealing filler (55) in the siphon-type open/close device (1);
• the lower part of the valve rod (3) is arranged inside of the valve body (4);
• two sides of the valve body (4) are provided with side water inlets (14) and the bottom of the valve body (4) is provided with a tapered bottom water outlet (16);
• the lower end of the valve rod (3) is connected with a tapered bottom valve plug (7);
• the lower tapered part of the tapered bottom valve plug (7) is matched with the tapered bottom water outlet (16);
• the extensible side-sealing top-pressing assembly (5) is arranged on the top of the tapered bottom valve plug (7) via a guide piece (15) on the valve rod (3);
• the top of the extensible side-sealing top-pressing assembly (5) presses upon a holding piece (11) on the valve rod (3);
• the two top ends of each side of the extensible side-sealing top-pressing assembly (5) press upon the smooth back surfaces of the side rotary sealing plates (6) in rolling-sliding contact therewith;
• the upper parts of the side rotary sealing plates (6) are rotatably connected with suspension brackets (12) on the inner wall of the valve body (4) through hinge pieces (13);
• the front sealing surfaces of the side rotary sealing plates (6) fittingly connect with the inner sealing surfaces of the side water inlets (14);
• the smooth back surfaces of the side rotary sealing plates (6) are inclined at an angle of five degrees relative to the central axis of the valve rod (3);
• the side water inlet emergency plug (10) is extractably connected with an extractable cap (9) on the valve cover assembly (2);
• the piston (20) in the siphon-type open/close device (1) is slidably seal-connected with the inner wall of the inner main bushing body (19) through a sealing ring (26);
• the upper part of the open/close nut (8) in the valve cover assembly (2) and the siphon-type open/close device (1) are plug connected and sealed by a sealing ring (50);
• the sealing pieces (51), (52), (53), (54) are sequentially arranged between the open/close nut (8), the gland bush (45), the bracket (46), the spinning sleeve (47) and the gland cover (48);
• the space between the gland cover (48) and the annular stuffing slot (49) on the valve cover is filled with sealing fillers (55), and further seal-connected to the valve rod (3);
• the outer part of the guide and positioning bolt (60) is provided with a fixing nut (57);
• sealing gaskets (56), (58) are placed between the bracket (46) and the fixing nut (57), and between the fixing nut (57) and the head nut (59);
• the space below the bottom of the piston (24) and above the sealing filler (55) in the siphon-type open/close device (1) constitutes a sealed valve rod cavity (62).