US 12,435,799 B2
Differential pressure driven diaphragm valve with separated drive chamber and valve actuation chamber, and assembling method thereof
Shengzhou Zhang, Guangdong (CN)
Assigned to KOSCN Industrial Manufacturing (Shenzhen) Co., Ltd., Guangdong (CN)
Filed by KOSCN Industrial Manufacturing (Shenzhen) Co., Ltd., Guangdong (CN)
Filed on Mar. 1, 2024, as Appl. No. 18/592,688.
Claims priority of application No. 202310248866.3 (CN), filed on Mar. 3, 2023.
Prior Publication US 2024/0295270 A1, Sep. 5, 2024
Int. Cl. F16K 7/17 (2006.01); F16K 7/12 (2006.01); F16K 31/122 (2006.01)
CPC F16K 7/17 (2013.01) [F16K 7/12 (2013.01); F16K 31/1221 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A differential pressure driven diaphragm valve with separated drive chamber and valve actuation chamber, comprising:
a piston assembly, comprising an axially movable drive rod and a piston plate fixed on the axially movable drive rod, wherein an upper surface of the piston plate is provided with a groove for a plurality of eccentrically arranged elastic bodies to abut against;
a cylinder body defining a differential pressure driven chamber, the cylinder body comprising a cylinder base and a cylinder cover fixedly connected to each other in a threadedly snap connection manner, wherein the piston plate is subjected to an upper differential pressure and a lower differential pressure, so as to be lifted or lowered in the differential pressure driven chamber to synchronously lift or lower the axially movable drive rod; the plurality of eccentrically arranged elastic bodies are provided in the cylinder cover; the piston plate is positioned in the differential pressure driven chamber; the plurality of eccentrically arranged elastic bodies are configured to have a preset elastic stroke, so that the plurality of eccentrically arranged elastic bodies do not provide an elastic force at a beginning of screwing of the cylinder cover with the cylinder base; and a first end of the axially movable drive rod is positioned in a central hole of the cylinder cover, and a second end of the axially movable drive rod is configured to pass through the cylinder base and a valve cover;
a valve body defining a valve actuation chamber, the valve body comprising a valve base and the valve cover combined with each other, wherein the cylinder base is fixedly connected to the valve cover by indirect screw connection near a shaft center and radial convex-convex limiting at a shaft periphery of a shaft;
a diaphragm piece positioned in the valve actuation chamber and configured for blocking a first flow passage and a second flow passage in the valve base, wherein a non-rotatable connection relationship is formed between a periphery of the diaphragm piece and at least one of the valve cover or the valve base;
a diaphragm press block positioned in the valve actuation chamber, the diaphragm press block configured for pushing the diaphragm piece to achieving blocking; and
a shaft coupler configured for connecting the second end of the axially movable drive rod with a central connecting portion of the diaphragm piece so that a non-rotatable connection relationship is formed between a center of the diaphragm piece and the shaft coupler, wherein the shaft coupler is detachably positioned inside the diaphragm press block and positioned on the diaphragm piece, so that a relatively rotatable connection relationship is formed between the shaft coupler and the axially movable drive rod, and a non-rotatable connection relationship is formed between the shaft coupler and the diaphragm press block; wherein the diaphragm press block has a plurality of peripheral teeth, and the valve cover has a plurality of longitudinal guide grooves for guiding sliding of the plurality of peripheral teeth, so that a non-rotatable and relatively liftable limiting relationship is formed between the diaphragm press block and the valve cover.