CN101975293B

CN101975293B - Micro-pressure check valve

Info

Publication number: CN101975293B
Application number: CN 201010532197
Authority: CN
Inventors: 宋保明; 杨学志; 张博竞
Original assignee: TIANJIN BAILI ZHANFA GROUP CO Ltd
Current assignee: TIANJIN BAILI ZHANFA GROUP CO Ltd
Priority date: 2010-11-04
Filing date: 2010-11-04
Publication date: 2013-01-09
Anticipated expiration: 2030-11-04
Also published as: CN101975293A

Abstract

The invention relates to a micro-pressure check valve. The valve comprises a valve cover, a valve clack, a support, a pressure spring, a screw cover and a valve body, wherein the valve cover, the valve body, a valve core and the support are coaxially arranged; and the pressure spring is sleeved on the valve clack which is arranged between the valve clack and the screw cover. The micro-pressure check valve is characterized in that: (1) the valve clack is a diameter variable valve clack, the diameter of the valve clack at a medium inlet is smaller than that of the valve clack at a medium outlet, and a through hole which is communicated with the inner cavity of the support is formed on the screw cover; and (2) an air hole which is communicated with the outside atmosphere and traverses the support and the valve body is radially formed in a valve clack cavity. The check valve has the advantages of simple structure, scientific design, function of sealing at a low pressure difference, flexibly valve action and reliable operation, and the micro-pressure check valve is widely used for various water injection systems.

Description

Micropressure check valve

Technical field

The invention belongs to the valve class, especially a kind of Micropressure check valve.

Background technique

Safety check has rotary-open type and two kinds of structures of rise-fall type, the advantages such as simple in structure, convenient installation that the rotary-open type structure has, but boundary dimension is larger, takes up room more, and the installation position is equipped with clear and definite specific (special) requirements; And the lifting structure compact structure, and to the mounting point without special requirement, but poor hour when inlet/outlet end pressure medium, valve is then difficult realizes sealing.

Above-mentioned existing two kinds of safety check and present patent application structurally reach all larger difference on the function.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, a kind of Micropressure check valve is provided, this safety check efficiently solves pressure difference tight, problem that can't seal of valve closing when very little.

The object of the present invention is achieved like this:

A kind of Micropressure check valve comprises valve gap, flap, support, pressure spring, gland, valve body, the coaxial installation of valve gap, valve body, spool and support, and the flap between flap and gland is set with pressure spring, it is characterized in that:

(1) described flap is the reducing flap, and the diameter of the flap at corresponding MEDIA FLOW Inbound place is less than the diameter of the flap at MEDIA FLOW outgoing direction place, gland be shaped with one be communicated with rack bore through hole.

(2) radially be shaped with a vent that is communicated with outside atmosphere in the flap chamber, this vent crosses support and valve body.

And, between the valve body of vent both sides and support, all adopt the seal ring sealing.

Advantage of the present invention and good effect are:

1, the built-up welding on the valve gap interior edge face of this safety check has valve seat, at support flap is installed, below flap, be coaxially installed with a Compress Spring, support is installed on the valve body by screw thread, be provided with vent at support and valve body, space between this vent connection bracket and the flap and extraneous atmosphere, valve vertical position and horizontal position all can be installed, and are not subjected to the restriction of mounting point.

2, this check valve structure is simple, and design science has the function of low voltage difference sealing, and valve event is flexible, and reliable operation is widely used in various flood patterns.

Description of drawings

Accompanying drawing 1 is cross section of the present invention sectional structure chart.

Embodiment

Be further described below in conjunction with 1 pair of embodiments of the invention of accompanying drawing, need to prove: the present embodiment is descriptive, is not determinate, can not limit protection scope of the present invention with this.

A kind of Micropressure check valve, formed by main parts size such as valve gap 1, flap 12, support 3, pressure spring 7, gland 9, valve bodies 10, the coaxial installation of valve gap, valve body, spool and support, wherein, seal ring 2 sealings are installed and adopted to valve gap with valve body is coaxial by thread engagement, coaxial by thread engagement mode mounting bracket in valve body, the interior coaxial installation flap of support also adopts

seal ring

6,13 sealings, by bolt 11 coaxial installation glands, gland is limited in flap in the rack bore this support at the MEDIA FLOW outgoing direction; Flap between flap and gland is set with pressure spring.

Innovative point of the present invention is:

(1) described flap is the reducing flap, and the diameter of the flap at corresponding MEDIA FLOW Inbound place is shaped with the through hole 8 of a connection rack bore less than the diameter of the flap at MEDIA FLOW outgoing direction place at gland.

(2) radially be shaped with a vent 5 that is communicated with outside atmosphere in the flap chamber, this vent crosses support and valve body, and all adopts seal ring 4 sealings between the valve body of vent both sides and support.

Working principle of the present invention is:

Be provided with vent at support and valve body, be communicated with space and extraneous atmosphere between support and the flap, flap can be moved, liquid medium flows into from the valve inlet end, outlet end flows out, when the liquid medium reverse flow, because flap is the reducing flap, it is little at entrance point place area, outlet end place area is large, so when even the inlet/outlet end pressure is poor very little, because outlet end place flap area is larger, have the very large seat power of returning, guaranteed the sealability of valve.

Claims

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.