The method of determining the characteristics of the dimensionless flow parameters flow of the working fluid in the valve clearances

 

The invention relates to the field of hydraulics and are intended for use to determine characteristics of the dimensionless flow parameters flow of the working fluid in the valve clearances in the design and study of these technical devices. The method of determining the characteristics of the dimensionless flow parameters flow of the working fluid in the valve clearances is that served in the underwater channel valve working fluid and poured it through an outlet channel. At different levels of relative back pressure is maintained on the output gap of the valve and is defined as the ratio of the pressure of the discharge to the discharge pressure, the stepped change in the gap of the valve pressure drop. This differential pressure is defined as the pressure difference between discharge and discharge. This creates the corresponding values of the pressure of discharge and discharge. For each fixed value of pressure drop in steady state, determine the flow rate of the working fluid flowing through the valve clearance. Before the beginning of prolific set the shutter valve relative to the housing in a position corresponding to zero clearance. In the process of prolific determine parameterdesc angle expiry of the flow in the gap of the valve, corresponding to this movement, calculate the area of the bore of valve clearance-defined shape, size and amount of movement of the shutter valve. Then calculate the flow coefficient, the ratio of the flow and the Reynolds number on the proposed equations. This method aims to obtain the ability to define all characteristics of the dimensionless flow parameters flow of the working fluid in the valve clearances. 1 Il.

Description text in facsimile form (see graphic part) Tn

Claims

The method of determining the characteristics of the dimensionless flow parameters flow of the working fluid in the valve clearances, namely, that served in the underwater channel valve working fluid and poured it through an outlet channel, at different levels of relative pressure p, supported on the output gap of the valve and defined as R = Rwith/pnwhere Rn- discharge pressure, and Rwith- pressure drain, a stepped change in the gap of the valve pressure dropR, defined asR = Rn-Rwithwhile creating the corresponding value is the exerciseR in the steady state, determine the flow rate of the working liquid Q flowing through the gap of the valve, characterized in that before the beginning of prolific set the shutter valve relative to the housing in a position corresponding to zero gap, in the process of prolific determine the displacement X of a spring-loaded without the initial preload of the spring of the shutter valve, using a transparent model of the valve determine the angle of expiry of the threadin the gap of the valve corresponding to the movement of X, compute the area of the bore of the valve clearance S defined shape, size and amount of movement of the shutter valve X, and then calculate the coefficient of dischargethe expression

the compression ratio of the threadthe expression

and the Reynolds number Re on the expression

where ST1- the area of the loading end of the gate valve;

ST2- the area of the drain end of the gate valve;

Topthe spring constant;

d - diameter submarine pipeline valve;

- the square of the

 

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