A durable air main valve and a pneumatic double diaphragm pump equipped with the air main valve.

Abstract

This invention proposes a durable air main valve and a pneumatic dual-diaphragm pump equipped with the air main valve. The durable air main valve includes a valve body with a left and a right cover installed at both ends. A reversing plate is also installed on the valve body, with a first working hole, a second working hole, and an exhaust hole located between them. Two valve core sleeves and a piston sleeve are installed inside the valve body. A valve core is installed inside each of the two valve core sleeves, with a piston at one end of each valve core. A sliding cover is installed on one side of each valve core, with a recessed hole at its bottom. The valve body also has an air interface, a first connecting hole, and a second connecting hole. A connecting groove is also provided on the valve core. The piston sleeve in this air main valve reduces the friction coefficient between the piston and the valve body, reducing the probability of wear and damage to the sliding seal ring. This, in turn, reduces the probability of reduced efficiency and malfunctions in the air main valve due to wear and damage to the sliding seal ring.

Claims

1. A durable air main valve, comprising a valve body, characterized in that: a left cover and a right cover are respectively installed at both ends of the valve body; a reversing plate is also installed on the valve body, the reversing plate having a first working hole, a second working hole, and an exhaust hole located between the two; two valve core sleeves and a piston sleeve are installed inside the valve body, valve cores that slide left and right are installed inside the two valve core sleeves, a piston that slides along the piston sleeve is provided at one end of the valve core, a sliding cover that moves with the valve core and contacts the plane of the reversing plate is installed on one side of the valve core, a recessed hole is provided at the bottom of the sliding cover, and when the sliding cover moves left and right, the two working holes alternately connect to the exhaust hole through the recessed hole; the valve body is also provided with an air interface, a first connecting hole, and a second connecting hole connecting the chamber between the piston and the right valve core sleeve; the valve core is also provided with a connecting groove connecting the air interface and the space between the valve core and the left cover; sealing rings are installed between the valve core and the second valve core sleeve, and between the piston and the valve body.

2. The durable air main valve as described in claim 1, wherein, A V-shaped notch is provided on one side of the sealing ring.

3. The durable air main valve as described in claim 1, wherein, The sliding cover and reversing plate are made of ceramic.

4. The durable air main valve as described in claim 1, wherein, A sealing ring is provided between the left and right cover and the valve body.

5. The durable air main valve as described in claim 1, wherein, The piston and valve core are separate components.

6. The durable air main valve as described in claim 1, wherein, The piston sleeve is located between the right valve core sleeve and the right cover and presses the right valve core sleeve tightly.

7. The durable air main valve as described in claim 1, wherein, The left and right covers are installed at both ends of the valve body by screws.

8. The durable air main valve as described in claim 1, wherein, The piston sleeve is made of POM, ceramic, or polytetrafluoroethylene.

9. A pneumatic dual-diaphragm pump equipped with the air main valve, characterized in that: it includes a housing and a durable air main valve as described in any one of claims 1 to 8; the housing is provided with a pump inlet, a pump outlet and a total exhaust port; the housing is provided with a left liquid chamber, a right liquid chamber, a left air chamber and a right air chamber; a left diaphragm is provided between the left liquid chamber and the left air chamber, and a right diaphragm is provided between the right liquid chamber and the right air chamber; the first working hole of the air main valve is connected to the left air chamber, the second working hole is connected to the right air chamber, and the exhaust port and the second connecting hole are connected to the pump's total exhaust port.

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