The novel solution of ball valve with replaceable orifice. Numerical and field tests

Abstract

The article presents the results of numerical calculations and experimental results of a flow through the orifice. Such a measuring device was built-into the ball valve that gave unique possibility of the orifice exchange without the pipeline disassemble. The advantages of using the prototypical solution has been described. This patented solution has been tested extensively for the durability and tightness. The article contains comparison between flow character in the case of single-hole orifice and a multi-nozzle one. The prototypical measuring device has been produced and assembled in compressed air system in the Power Plant Opole, that gave experimental verification of theoretical approach.

Uncertainty Assessment for Determining the Discharge Coefficient C for a Multi-Opening Orifice

“…After substituting components of Equations ( 7)- (11) in Equation ( 6) for combined relative standard uncertainty of determining discharge coefficient u(C)/C, the dependence (12) was obtained:…”

“…Such a design gives the orifice higher ability to counteract the distortions, compared to the standard orifice (as it requires smaller straight segments of the pipeline before and behind the orifice). Such an advantage has been used when building a cut-off ball valve, where the valve ball has a multi-opening orifice built into it for measuring the stream of the flowing liquid [11]. In the literature concerning multi-opening orifices of such type, one can also come across a comparison of results from the experiment and numerical modelling for a progressed turbulent flow [12,13].…”

Numerical study on a rotational hydraulic damper with variable damping coefficient

“…Hydraulic dampers produce resistance torques or forces by letting the fluid passes through the orifice 21 , 22 . The torques or forces are positively correlative to the cross-sectional area of the orifice and the velocity of the fluid 23 , 24 . Thus, the rotational hydraulic damper is like a rotational pump with a valve.…”

“…So, it is significant to develop a new hydraulic rotational damper that could change the coefficient in a wide range with an infinite rotational angle.Hydraulic dampers produce resistance torques or forces by letting the fluid passes through the orifice 21,22 . The torques or forces are positively correlative to the cross-sectional area of the orifice and the velocity of the fluid 23,24 . Thus, the rotational hydraulic damper is like a rotational pump with a valve.…”