German VMC SpA valves, VMC SpA models, VMC SpA prices

VMC SpA 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 emerging technology, widely applied in industrial and agricultural production, was developed based on the principle of hydrostatic pressure transmission proposed by Pascal in the 18th century.

Basic principles of VMC SpA valves

The fundamental 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 used is called the working medium, typically mineral oil, which functions similarly to transmission components such as belts, chains, and gears in mechanical drives. Hydraulic transmission utilizes Pascal's principle! Pascal's principle essentially states that 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: applying a force to a small-area object results in a large force on a large-area object via Pascal's principle, thereby achieving the effect of lifting heavy loads. Hydraulic transmission is also widely used 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 VMC SpA valves

Advantages: 1) Small size and light weight, resulting in low inertial force; no significant impact occurs during sudden overload or stopping; 2) Traction speed can be automatically adjusted smoothly 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 VMC SpA valves

In the manufacturing process of hydraulic valves, selective assembly is mostly chosen to effectively improve assembly precision. That is, for a batch of machined 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 is inspected and measured, classified based on the 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, a valve body and valve spool with appropriate clearance 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 size, followed by lapping 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 gap 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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