CN101975293B - Micro pressure check valve - Google Patents

Abstract

The invention relates to a micro-pressure check valve, comprising a valve cover, a valve disc, a bracket, a pressure spring, a gland, a valve body, the valve cover, the valve body, a valve core and a bracket are coaxially installed, between the valve disc and the gland A pressure spring is set on the valve disc between them, and the characteristics are as follows: (1) The valve disc is a variable-diameter valve disc, and the diameter of the valve disc in the direction corresponding to the inflow of the medium is smaller than the diameter of the valve disc in the direction of the outflow of the medium. A through hole communicating with the inner chamber of the bracket is formed on the cover. (2) There is a vent hole connected to the external atmosphere radially formed in the disc chamber, and the vent hole crosses the bracket and the valve body. The check valve has simple structure, scientific design, low-pressure differential sealing function, flexible valve action, reliable operation, and is widely used in various water injection systems.

Description

Micro pressure check valve

technical field

The invention belongs to valves, in particular to a micro-pressure check valve. the

Background technique

The check valve has two structures: swing type and lifting type. The swing type structure has the advantages of simple structure and convenient installation, but it has a large size, takes up more space, and has clear special requirements for the installation position; while the lifting type has the advantages of simple structure and convenient installation. The structure is compact, and there is no special requirement for the installation position, but when the medium pressure difference between the inlet and outlet is small, it is difficult for the valve to achieve sealing. the

The above-mentioned existing two kinds of check valves are quite different from the present patent application in structure and function. the

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide a micro-pressure check valve, which effectively solves the problem that the valve is not tightly closed and cannot be sealed when the pressure difference is small. the

The purpose of the present invention is achieved like this:

A micro-pressure check valve, including a valve cover, a valve disc, a bracket, a pressure spring, a gland, a valve body, the valve cover, the valve body, a valve core and a bracket are coaxially installed, and the valve between the valve disc and the gland The pressure spring is set on the petal, which is characterized in that:

(1) The disc is a variable-diameter disc, the diameter of the disc corresponding to the inflow direction of the medium is smaller than the diameter of the disc in the outflow direction of the medium, and a through hole communicating with the inner cavity of the bracket is made on the gland. the

(2) There is a vent hole connected to the external atmosphere radially formed in the disc chamber, and the vent hole crosses the bracket and the valve body. the

Moreover, sealing rings are used to seal between the valve body and the support on both sides of the vent hole. the

Advantage and positive effect of the present invention are:

1. The check valve has a valve seat surfacing on the inner end surface of the bonnet, a valve disc is installed on the bracket, and a compression spring is coaxially installed under the valve disc. The bracket is installed on the valve body through threads. There is a vent hole on the valve body, which connects the gap between the bracket and the disc and the outside atmosphere. The valve can be installed in both vertical and horizontal positions without being limited by the installation position. the

2. The check valve has simple structure, scientific design, low-pressure differential sealing function, flexible valve action, reliable operation, and is widely used in various water injection systems. the

Description of drawings

Accompanying drawing 1 is a cross-sectional structural diagram of the present invention. the

Detailed ways

Embodiment of the present invention is described in further detail below in conjunction with accompanying drawing 1, it should be noted that: present embodiment is descriptive, not delimitative, can not limit protection scope of the present invention with this. the

A micro-pressure check valve, which is composed of main components such as a valve cover 1, a valve disc 12, a bracket 3, a pressure spring 7, a gland 9, and a valve body 10, and the valve cover, valve body, valve core and bracket are coaxially installed , wherein the bonnet and the valve body are coaxially installed through threaded engagement and sealed with a sealing ring 2, and the bracket is coaxially installed in the valve body through threaded engagement, and the valve disc is coaxially installed in the bracket and sealed with sealing rings 6 and 13. The bracket is coaxially installed with a gland through the bolt 11 in the medium outflow direction, and the gland restricts the valve disc in the inner cavity of the bracket; a pressure spring is set on the valve disc between the valve disc and the gland. the

The innovation of the present invention is:

(1) The valve disc is a variable-diameter disc, the diameter of the valve disc corresponding to the inflow direction of the medium is smaller than the diameter of the valve disc in the outflow direction of the medium, and a through hole 8 communicating with the inner cavity of the bracket is formed on the gland. the

(2) A vent hole 5 connecting to the outside atmosphere is formed radially in the disc chamber, the vent hole traverses the bracket and the valve body, and a sealing ring 4 is used to seal between the valve body and the bracket on both sides of the vent hole. the

The working principle of the present invention is:

There is a vent hole on the bracket and the valve body, which communicates the gap between the bracket and the valve disc and the outside atmosphere, so that the valve disc can move, the liquid medium flows in from the inlet end of the valve, and flows out from the outlet end. When the liquid medium flows in the opposite direction , because the valve disc is a variable-diameter disc, its area at the inlet end is small, and the area at the outlet end is large, so even if the pressure difference between the inlet and outlet ends is small, because the area of the valve disc at the outlet end is large, it has a large return Seating force ensures the sealing performance of the valve. the

Claims (2)

1. a Micropressure check valve comprises valve gap, flap, support, pressure spring, gland, valve body, and the coaxial installation of valve gap, valve body, spool and support is characterized in that:

⑴ described flap is the reducing flap, consisted of by left part, middle part and right part three parts, the diameter of the left part at corresponding MEDIA FLOW Inbound place is less than the diameter at the middle part at MEDIA FLOW outgoing direction place, right part between middle part and gland is set with pressure spring, is shaped with the through hole of a connection rack bore at gland;

⑵ support is interior installs flap, and flap middle part and support sealing, and gland is limited in flap in the rack bore, radially is shaped with the vent of a connection outside atmosphere at the rack bore of MEDIA FLOW Inbound, and this vent crosses support and valve body.

2. Micropressure check valve according to claim 1 is characterized in that: all adopt the seal ring sealing between the valve body of vent both sides and support.

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