German Gestra valves Gestra models Gestra prices

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

Gestra 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 transmission components such as belts, chains, and gears in mechanical transmission. Hydraulic transmission utilizes Pascal's principle! Pascal's principle is roughly: in a closed environment, when a force is applied to a liquid, this liquid transmits the force in all directions, with the magnitude of pressure remaining unchanged! P=F/S. Hydraulic transmission utilizes this physical property to apply a force to an object with a small area, using Pascal's principle to subject an object with a large area to a significant force! Thereby achieving the effect of lifting heavy objects. Hydraulic transmission is also widely applied in the valve industry, such as in machine tool manufacturing and processing equipment for valves, hydraulic test equipment for valves, and hydraulic transmission devices for valves.

Gestra valve advantages and disadvantages

Advantages: 1) Small volume and light weight, resulting in lower inertial force, so 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; without changing the motor rotation direction, it is relatively convenient to convert between rotary and linear reciprocating motion of the working mechanism; 4) The hydraulic pump and hydraulic motor are connected by oil pipes, so there are no strict restrictions on spatial arrangement; 5) Since oil is used as the working medium, the relative moving surfaces of components can self-lubricate, 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 be kept clean; 2) High manufacturing precision is required for hydraulic components, the process is complex, and the cost is high; 3) Maintenance of hydraulic components is complex and requires a high level of technical skill; 4) Using oil as the working medium poses a fire hazard at the working surface; 5) Low transmission efficiency.

Gestra valve maintenance methods

In the manufacturing process of hydraulic valves, to effectively improve assembly precision, the selective assembly method is mostly chosen. That is, 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, and then assembled, thereby ensuring that the valve spool has good sliding performance and good sealing performance. In other words, for hydraulic valves of the same type, there may be certain differences in the mating dimensions between the valve body and the valve spool. In actual use, when there are a large number of failed hydraulic valves in an enterprise, all hydraulic valves can be disassembled and cleaned, each part inspected and measured, parts classified according to the inspection results, and then recombined and selected using certain 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, then 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%, then certain methods should be adopted to increase the valve spool size, followed by lapping and repair. For the valve seat and valve spool in conical valve groups, if the contact surface sealing in the conical seat valve is poor, since the conical valve can automatically compensate for the gap under the action of a spring, grinding is sufficient. 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, then the selection of the valve body and valve spool should meet the interference requirement in the machining allowance. For the valve body bore, it should be appropriately reamed, and for the valve spool, it should be appropriately ground, so that the shape precision and assembly clearance are reasonable.

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