Silent check valve Silent one-way valve Flange check valve

Among them, internal thread
check valve
, butterfly type
check valve
belong to this type of valve, which includes swing type
check valve
/> and lift type
check valve
. Swing type
Check valve
has a hinge mechanism and a door-like valve disc that freely leans on the inclined valve seat surface. In order to ensure that the valve disc can reach the appropriate position of the valve seat surface every time, the valve disc is designed in the hinge mechanism so that the valve disc has enough swing space and makes the valve disc truly and comprehensively contact the valve seat. The valve flap can be made entirely of metal, or it can be inlaid with leather, rubber, or synthetic coverage on the metal, depending on the performance requirements. Swing check valve
When fully open, the fluid pressure is almost unimpeded, so the pressure drop across the valve is relatively small. The valve disc of the lift check valve is located on the sealing surface of the valve seat on the valve body. Except that the valve disc can rise and fall freely, the rest of this valve is like a stop valve. The fluid pressure causes the valve disc to lift from the sealing surface of the valve seat. The backflow of the medium causes the valve disc to fall back to the valve seat and cut off the flow. Depending on the conditions of use, the valve disc can be an all-metal structure, or it can be inlaid with a rubber pad or rubber ring on the valve disc frame. Like the stop valve, the passage of fluid passing through the lift
check valve
is also narrow, so the pressure drop through the lift
check valve
is smaller than that of the swing
/> Check valve
is larger, and the flow of swing
check valve
is less restricted. This type of valve should generally be installed horizontally in pipelines.
, Check valve can be divided into
and
Silent check valve
according to its structure and installation method. The valve disc is disc-shaped and rotates around the rotating axis of the valve seat channel. Because the channel inside the valve is streamlined, the flow resistance is smaller than that of the rising butterfly check valve. It is suitable for low flow rates and large diameter situations where the flow does not change frequently, but it is not suitable for pulsating flow. The sealing performance is not as good as that of the lifting type. Butterfly type
Check valve
It is divided into three types: single-disc type, double-disc type and multi-half type. These three forms are mainly divided according to the valve diameter. The purpose is to prevent the medium from weakening when it stops flowing or reverses the flow. Water shock.
,
Silent check valve
The valve disc slides along the vertical centerline of the valve body
Check valve
, internal thread
Check valve< br/> It can only be installed on horizontal pipelines. In high-pressure small-diameter
check valves
the valve disc can be made of round balls. The valve body shape of the butterfly check valve is the same as that of the stop valve (it can be used universally with the stop valve, so its fluid resistance coefficient is large. Its structure is similar to that of the stop valve, the valve body and valve disc are the same as the stop valve The valve is the same. The upper part of the valve disc and the lower part of the valve cover are processed with guide sleeves. The valve disc guide can be freely lifted and lowered in the valve guide. When the medium flows downstream, the valve disc opens by the thrust of the medium. When the medium stops flowing, the valve opens. The flap falls on the valve seat by itself, preventing the reverse flow of the medium. Straight-through butterfly type
Check valve
The direction of the medium inlet and outlet channel is vertical to the direction of the valve seat channel, vertical lifting type
Check valve
, the direction of the medium inlet and outlet channel is the same as the direction of the valve seat channel, and its flow resistance is smaller than the straight-through type.
,
Silent check valve
The valve disc surrounds the valve The pin in the seat rotates
Check valve
. Disc type
Check valve
has a simple structure and can only be installed on horizontal pipes, with good sealing performance.
/> ,
Silent check valve
A valve whose disc slides along the center line of the valve body. Pipe type
Check valve
is a new type of valve, its Small size, light weight and good processing technology are one of the development directions of
check valve
. However, the fluid resistance coefficient is slightly larger than that of swing type
check valve
.
, compression type
check valve
This valve is used as a boiler feed water and steam cut-off valve. It has a lift type
check valve
and Comprehensive functions of stop valve or angle valve.
In addition, there are some
check valves
that are not suitable for installation at the pump outlet, such as bottom valve, spring type, type, etc.
Return valve
.
,
Silent check valve
Purpose and performance specifications
This valve is used on industrial pipelines as a device to prevent the reverse flow of media.
Performance Specifications
,
Silent Check Valve
Functional Principle and Structural Description
When this valve is in use, the medium flows in the direction of the arrow in the diagram.
, The medium flows in the direction of the arrow. When the flow flows in the specified direction, the valve disc is affected by the force of the medium. When the opened medium flows counter-flow, the valve disc is tightly closed with the sealing surface of the valve seat due to the self-weight of the valve disc and the reverse force of the medium, thereby preventing the valve from closing. The purpose of medium counterflow.
The sealing surface of the valve body and valve disc is made of stainless steel surfacing.
The structural length of this valve is in accordance with the regulations of /, and the flange connection size is in accordance with the regulations of /.
, Sound check valve
Materials of main parts
Parts name

Valve body, valve cover, valve disc

Sealing surface
< br/> Rocker

Pin

Gasket

Part material

Carbon steel
< br/> Hard alloy surfacing

Carbon steel

Chromium stainless steel

Flexible graphite+