Spring body length specified stretch spring:

Free length specified stretch spring is the customer according to the actual use of the demand to determine the spring length, there is a standard stiffness value in the fixed length for customer reference, if there is a deviation between the selected length and the standard length, then we can calculate the theoretical stiffness value of the customer selected length according to the formula: (the formula is as follows: stiffness value =50/S specified length X foundation stiffness). Free length theory calculation formula (free length L=S+(OD-2d)X2. According to the above formula, the stiffness and free state length of the selected product can be calculated.

Network optimization materials:

Two metrological verification standards

Measurement and verification of machinery and equipment

1 Normator

Customize high temperature resistant elastic yellow tube type precision pressure gauge, elastic yellow tube type high precision negative pressure gauge; Third class piston machine vacuum pressure gauge, third class piston machine working pressure vacuum gauge; Third class liquid vacuum pressure gauge:

Other standard measuring instruments of the same degree.

During metrological verification, the comprehensive deviation of the normator shall not exceed 1/3 of the square root of the base deviation of the barometer being tested.

2 Other machines and equipment

Barometer calibrator; Air pressure source, mechanical pump; Megohm meter with operating standard voltage of 500V; Signal isolator for measuring and verifying co2 meters; Signal machine for measuring and verifying data signal deviation of electric contact type barometer, etc.

Working temperature of measurement verification: 20±5℃.

Customized high temperature resistance mold spring to measure the upper limit value is not more than 0.25MPa of the barometer, the working substance must be gas or other non-toxic, no harm, organic chemical characteristics of the stable vapor body.

For measuring the upper limit value of more than 0.25MPa barometer, the material should be liquid in the work of customized waveform spring