250MPa high precision 0.02 deadweight tester

Piston deadweight tester as the most important benchmark instrument, is mainly used to check other pressure gauge, is one of the benchmark pressure instrument, is also a benchmark price on the market at present the highest pressure equipment, our factory production of piston type pressure gauge are not limited to obtain national verification certificate, more focused on measurement using convenience, make high efficiency easier is our for the market positioning of piston manometer.

Piston pressure gauge is a basic pressure gauge.It is mainly composed of hand-operated pressure generator, standard piston measuring head, standard weight set, hydraulic system and various control valves.When the oil cup valve is in the open state, the system can be filled with media through the hand pressure generator (or pressure checker).When the oil cup valve is closed, the deadweight tester becomes a closed pressure system.The closed system is then controlled by a hand - operated pressure generator.

During the whole working process, the piston type deadweight tester will work stably according to the hydrostatic equilibrium principle.The pressure of the system changes as weights are added or reduced on the piston chassis.To balance the pressure of the system against the force of the piston chassis and its connecting parts and the total mass of the standard weight carried at the time, the piston chassis shall be lifted (lowered) to the specified position by the manual pressure generator.The system pressure in this state is a standard pressure value.

Obviously, this is the practice of pressure concept definition, and the accuracy of this pressure value will depend entirely on the effective area of the piston system and the quality precision of the special weight.If the sealing state of the system needs to be removed, the oil cup needle valve can be opened slowly after the system pressure is lowered to the initial position of the piston chassis by the hand pressure generator.

Piston rod and piston cylinder are finely ground with tungsten carbide material to ensure good piston identification.
With low center of gravity structure, the piston system is more stable.
The piston system adopts the integral protection structure of tungsten carbide. The diameter of the protective shaft is 10mm. Both the protective shaft and piston rod are made of tungsten carbide.It ensures that the piston system is not damaged in use. This protection scheme is for our company to independently develop an efficient protection piston system (we are applying for an invention patent).
The piston pressure gauge adopts the external displacement proximity sensor, which can display the changes of the position of the piston system in real time. The display system is digital tube display, which is more intuitive, and the displacement height of the piston is 0-3 mm.The external displacement system is not embedded in the piston system and does not affect the piston protection system.
The piston pressure gauge adopts independent blowdown system. Under the piston system and under the output interface, there is an oil discharge pipeline. The oil returns to the oil cup directly, which ensures the cleanliness and hygiene of the piston table.
The piston cylinder adopts self-sealing system, and the sealing ring can ensure 30,000 cycles without leakage, which is really convenient and convenient.
The piston is equipped with a prepressurized device to make the pressure easier.
The piston type pressure gauge has a pre-pressurized device but no pre-pressurized stop valve.