High pressure differential flow large adjustable ratio control valve

Abstract

The invention relates to a high-pressure difference and high-flow rate adjustable ratio control valve. A valve base is arranged in a valve cavity of a valve body; a valve core mounting hole is formed in the valve base; a valve cover is fixedly arranged on the top of the valve body in a sealing way; a sleeve is arranged in the valve cavity and is arranged above the valve base; a big valve core is moveably arranged in an inner hole of the sleeve and the valve core mounting hole of the valve base; the upper part of the big valve core is connected with a valve core sleeve; a valve rod penetrates through the valve cover; the lower end of the valve rod is connected with the big valve core; a valve core upper cavity and a valve core through hole are formed in the big valve core; the lower end of the valve rod penetrates through the valve core sleeve to be inserted into the valve core upper cavity and the valve core through hole; a driving sheet is arranged on the part, positioned in the valve core upper cavity, of the valve rod; a small valve core integrated with the valve rod is connected to the lower end of the valve rod and is arranged in the valve core through hole. The ratio control valve is characterized in that two or more threaded flowing passages with different start points are arranged on the small valve core and are provided with a plurality of cross points. The ratio control valve is novel in structure and can resist high temperature and high pressure difference, wide-range flow control can also be realized, and an adjustment curve is good.

Description

technical field [0001] The invention relates to a control valve with large adjustable ratio of high pressure difference and flow rate, which belongs to the technical field of valve processing and manufacturing. Background technique [0002] With the increasing level of industrial automation, wide-range flow control has become a development trend. Now the working environment of the control valve is getting worse and worse, and sometimes the control valve needs to be able to be used under harsh working conditions such as high pressure difference, high temperature, and large adjustable ratio. However, at present, the control valves produced in China generally have shortcomings such as inability to withstand high temperature and high pressure difference, inability to achieve wide-range flow control, and poor adjustment curves. Rely on imports. [0003] For the above harsh working conditions, especially the boiler feed water application, the users and design institutes generall...

AI Technical Summary

Problems solved by technology

However, even foreign valve manufacturers do not have valves with new structures that can meet the requirements of high pressure difference and large flow rate adjustable ratio at the same time. On the one hand, purely large adjustable ratio cannot meet the requirements of high pressure difference; Wide-range flow control cannot be achieved, so domestic users generally choose more reliable imported high-pressure multi-stage step-down sleeve valves, but this kind of valve is poor in wide-range flow control, and basically cannot be adjusted in a small flow range

Or choose a foreign needle valve, but this kind of valve has a short service life for high pressure difference, and the valve core needs to be replaced frequently to meet the adjustment requirements, which means that the valve core must be kept, which greatly increases the cost of use, and also greatly affects the normal operation of the production line

There are also two valves used together to realize the principle of split-range control, or one to reduce pressure and one to adjust, which wastes a lot of cost, and the control is complicated and it is difficult to adapt to the development requirements of new processes.

Moreover, even imported products will have problems such as short service life, high noise, and limited adjustment range, so many domestic users have strong expectations that they can buy products that replace imported products in China.

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