Pneumatic valve pneumatic brake seat outside pressure is analyzed

abstract: this paper introduces the brake, the concept of pneumatic valve pneumatic seat subjected to external pressure, and use stress analysis design method of the pneumatic valve pneumatic seat on the stress intensity.
keywords: brake pneumatic valve; Pneumatic valve seat; External pressure; Introductions to the stress analysis


pneumatic valve is a kind of common truncation of the pneumatic valve, used to connect or truncation pipeline medium, but not suitable for regulating the flow of medium. The opening and closing it. ( Pneumatic disc) In the perpendicular to the plane of the pneumatic valve inside the center line of the channel for lifting movement, like the gate cutting medium, so called brake pneumatic valve. Pneumatic disc brake pneumatic valve according to its structure can be divided into elastic wedge type gate, wedge rigid single rigid double ram disc, wedge, parallel rigid single ram, parallel double ram, etc.
the wedge rigid double ram, for example, the specific introduction of pneumatic valve pneumatic brake valve seat stress situation.

pneumatic valve pneumatic brake valve seat force analysis on both sides sealed pneumatic valve is by increasing the pneumatic disc brake thrust of pneumatic valve seat, contact pressure fluid pressure should be greater than imports. The brake pneumatic valve on the downside, if closed under cold, then into the hot, pneumatic disc will appear, then form a closed position lock, when open the pneumatic valve again will meet with difficulties, it is commonly known as the 'kang'. Good state of the pneumatic brake valve is unilateral seal. Parallel brake pneumatic valve can only be one sided with export position of pneumatic seat seal. Standard wedge type pneumatic disc brake pneumatic valve is also same, pressure inlet side pneumatic disc deformation and fluid flow through the inlet side of pneumatic valve until the pneumatic valve cavity to achieve pressure balance. Pneumatic raises the exit seat subjected to external pressure of medium and the intensity of the problem.

figure realize unilateral seal in pneumatic valve
as shown, medium after entering pneumatic valve body lumen, ACTS on the export side, On the left) Pneumatic valve, pneumatic seat on the left side and pneumatic valve sealing surface to form a sealed pressure, prevent medium circulation. At the same time medium on the pneumatic valve body and the gap between the left side of the pneumatic valve seat, make the medium pressure pneumatic seat on the left side of the lateral. On the left side of the pneumatic valve seat strength calculation, is to deal with pneumatic seat by the state of the external pressure is analyzed, and the design method of using rules design already can't solve such a complicated problem. In this article USES the design method of analysis and design of double wedge type gate pneumatic seat intensity.
by analyzing the stress of the pneumatic valve seat, the pneumatic valve seat and the pneumatic valve body welding place for fixed constraint, pneumatic seat external cavity effect by medium pressure, pneumatic valve seat sealing surface by pneumatic valve seal than the effect of pressure, the detailed stress distribution as shown.


figure pneumatic seat force analysis of the Solid model into ANSYS analysis, choose the brick type Solid hexahedron elements, the modulus of elasticity of input materials and building ratio ( As shown in the table) , a free meshing model, the default solver to solve, it is concluded that the stress contours and strain contours of pneumatic seat.

'table' materials for CrMoV

the modulus of elasticity ( MPa）
。 E +


building than
.


mass density ( Kg/mm）
。 e-


the tensile strength (yield MPa）



the ultimate tensile strength ( MPa）




by stress analysis chart, the maximum stress appears in pneumatic pneumatic seat seat inner cavity and pneumatic seat and body welding joints, pneumatic seat shape changes in the location more intense and there are sharp corners, should belong to the peak stress, stress evaluation at the selected line, according to the JB - The stress classification principle ( As shown in the table) Classifying stress evaluation online stress, and to evaluate the online membrane stress and bending stress, respectively, comparing with limit, can be concluded that the design of the pneumatic valve seat is reasonable.

'table' of all kinds of stress intensity limit



symbol categories calculated value
limit



a thin film stress be
Pm Sm



a film + bending stress
MEM + BEND + Pb

Pm. Sm




conclusions through the stress analysis design method of pneumatic valve pneumatic brake valve seat can be stress intensity, at the same time can be concluded that the pneumatic seat design is reasonable.

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