German PB Swiss valves, PB Swiss models, PB Swiss prices

PB Swiss 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. This is an emerging technology developed based on Pascal's principle of hydrostatic pressure proposed in the 18th century, and it is widely used in industrial and agricultural production.

Basic principles of PB Swiss valves

The basic principle of hydraulic transmission is to use pressurized oil as the working medium within a sealed container to achieve energy conversion and power transmission. The liquid is referred to as the working medium, typically mineral oil, and its function is similar to that of transmission components such as belts, chains, and gears in mechanical drives. Hydraulic transmission utilizes Pascal's principle! Pascal's principle essentially states: in a sealed 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 leverages this physical property by applying 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 drive devices for valves.

Advantages and disadvantages of PB Swiss valves

Advantages: 1) Small size and light weight, resulting in low inertia; no major impact occurs during sudden overload or stopping; 2) Traction speed can be smoothly and automatically adjusted within a given range, enabling 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, relative moving surfaces 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 requires high maintenance standards; the working oil must always remain clean; 2) High manufacturing precision is required for hydraulic components, leading to complex processes and higher costs; 3) Maintenance of hydraulic components is complex and requires a high level of technical expertise; 4) Using oil as the working medium poses a fire hazard at the working surface; 5) Low transmission efficiency.

Maintenance methods for PB Swiss valves

In the manufacturing of hydraulic valves, selective assembly is mostly chosen to effectively improve assembly precision. This means that for a batch of finished parts, such as valve spools and valve bodies, the most reasonable fit clearance should be selected based on actual dimensions before assembly, ensuring good sliding performance and sealing performance of the valve spool. In other words, for hydraulic valves of the same type, there may be differences in the mating dimensions between the valve body and the valve 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 reassembled using selective assembly methods. After inspection, if wear is found on both the valve body and the valve spool, but there are no severe scratches on the working surface or no severe local wear, valve bodies and valve spools with appropriate clearances can be selected for reassembly. If the fit clearance between the valve body and the valve 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 valve spool dimensions, followed by lapping and repair. For conical valve groups, if the contact surface sealing between the valve seat and the valve spool is poor, grinding is sufficient because the conical valve can automatically compensate for the clearance under spring action. If the wear between the valve body and the valve is uneven or there are scratches on the working surface, and the above methods cannot restore the hydraulic valve function well, the selection of the valve body and valve spool should meet the interference requirements in the machining allowance. The valve body bore should be appropriately reamed, and the valve spool should be appropriately ground, so that shape precision and assembly clearance are reasonable.

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