German WIKA valves WIKA models WIKA prices

WIKA valves use liquid as the working medium to transmit energy and perform control. Hydraulic transmission and pneumatic transmission are collectively known as fluid power transmission, an emerging technology developed based on Pascal's principle of hydrostatic pressure transmission proposed in the 18th century, and is widely used in industrial and agricultural production.

WIKA valve basic principles

The basic principle of hydraulic transmission is to use pressurized oil as the working medium in a closed container to achieve energy conversion and power transmission. The liquid therein is called the working medium, generally mineral oil, and its function is similar to that of mechanical transmission components such as belts, chains, and gears. Hydraulic transmission utilizes Pascal's principle! Pascal's principle states that in a closed environment, when a force is applied to a liquid, the liquid transmits this force in all directions with unchanged pressure magnitude! P=F/S. Hydraulic transmission uses this physical property to apply a force to a small-area object, causing a large-area object to experience a significant force via Pascal's principle, thereby achieving the effect of lifting heavy loads. Hydraulic transmission is also widely applied in the valve industry, such as in machine tool manufacturing equipment for valves, hydraulic test equipment for valves, and hydraulic transmission devices for valves.

WIKA valve advantages and disadvantages

Advantages: 1) Small volume and light weight, resulting in low inertia; no major impact occurs during sudden overload or stopping; 2) Can smoothly and automatically adjust traction speed within a given range, and achieve stepless speed regulation; 3) Easy reversal; rotation and linear reciprocating motion of the working mechanism can be conveniently converted without changing the motor rotation direction; 4) Hydraulic pumps and hydraulic motors are connected by oil pipes, so spatial arrangement is not strictly limited; 5) Since oil is used as the working medium, relatively moving surfaces of components are self-lubricating, resulting in low wear and long service life; 6) Simple operation and control, with a high degree of automation; 7) Overload protection is easy to implement. Disadvantages: 1) Hydraulic transmission has high maintenance requirements; the working oil must always remain clean; 2) High manufacturing precision is required for hydraulic components, the process is complex, and costs are higher; 3) Maintenance of hydraulic components is complex and requires a high level of technical expertise; 4) Using oil as the working medium presents a fire hazard at the working surface; 5) Low transmission efficiency.

WIKA valve maintenance methods

In the manufacturing process of hydraulic valves, selective assembly is mostly chosen to effectively improve assembly precision. That is, for a batch of finished parts, such as spools and valve bodies, the most reasonable fit clearance should be selected based on actual dimensions before assembly, ensuring the spool has good sliding performance and sealing performance. In other words, for hydraulic valves of the same type, there may be differences in the mating dimensions between the valve body and spool. In actual use, when a company has a large number of failed hydraulic valves, all hydraulic valves can be disassembled and cleaned, each part inspected and measured, parts classified based on inspection results, and then recombined and selectively assembled using appropriate methods. After inspection, if wear is found on both the valve body and spool, but there are no severe scratches on the working surface or no severe local wear, valve bodies and spools with appropriate clearances can be selected for reassembly. If the fit clearance between the valve body and spool increases compared to the clearance specified in the product drawings, and the increase is between 20% and 25%, methods should be adopted to increase the spool size, followed by lapping and repair. For conical valve groups, if the contact surface sealing between the seat and spool is poor, grinding is sufficient because the conical valve can automatically compensate for clearance under spring action. If the wear between the valve body and spool is uneven or there are scratches on the working surface, and the above methods cannot restore the hydraulic valve function well, the selection of valve body and spool should meet the interference requirements in the machining allowance. The valve body bore should be appropriately reamed, and the spool should be appropriately ground, so that shape precision and assembly clearance are reasonable.

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