YJS-600 Digital Display Type Well Cover Hydraulic Compression Testing Machine

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Ⅰ、Main functions
This machine adopts hydraulic load, manual control, electronic measurement and digital display and has the function of force peak value preserving and manual eliminating force peak value. It is applicable for compressive strength test of well covers, which are made of steel fiber reinforced concrete and cast iron.
Ⅱ、Products catalogue
YJS-600A Standards:CJ/T121-2000、CJ/T3012-93
YJS-600B Standards:JC889-2001、JC/T948-2005
Ⅲ、Main Technical Specifications

Tyoe Parameters	YJS-600A	YJS-600B
Maximum testing force	600kN
Accuracy of testing force	±2%
Testing space(㎜)	1250×300	1280×260
Pressure plate size(㎜)	Ф356	Ф356（Manhole）；500×200、250×200（Water cover grate）
Piston stroke(㎜)	250
Power supply	380V±10%，50Hz
Overall dimension(L×W×H)(㎜)	1600×1000×1730	1600×1000×1800
Weight(kg)	2500	4000

Q: How to check the fire valve pressure gauge as normal?: Building regulations: hydrant mouth pressure should not be greater than 0.8MPa; the water pressure is not greater than 0.5MPa; the "high regulation": the building height of not more than 100 meters, the most unfavorable pressure should not be less than 0.07MPa; more than 100 meters should not be less than 0.15MPa; the water gun full water column general building should not be less than 7 meters, a and B class of workshop, more than 4 layers of workshop and warehouse, and high-rise building multi-storey buildings and buildings more than 6 storeys height of not more than 100 meters should not be less than 10 meters, high-rise buildings should not be less than 13 metres.Spray system is: the worst point of the system, the work pressure should not be less than 0.05MPaSome people love to see the fire pump room pressure, the pressure must be large, the requirements are not less than those of numerical pressure above the highest point on the line, a building with a fire hydrant with a pressure gauge, you see that the pressure gauge on the line. Spray, you go to the top end of the test water pressure gauge on the line.

Q: What's the pressure gauge in the snow?!: The refrigerant (freon refrigerant is a plus) to many professional personnel to operate the number of horses is such a 23= 26=1.25 (a horse) horse horse horse 32=1.5 25=1.75 (1.5 HP) 51=2.5 (2 HP) 7=23.5 horse horse (3 horses) is now commonly used in air conditioning.

Q: What is a back mounted pressure gauge and why is it called back loading?!: It should be the axial pressure gauge

Q: The working principle of the Bourdon tube pressure gauge: Bourdon tube pressure gauge is spring tube pressure gauge.Its working principle is that:The pressure gauge through the sensitive element in the table (Bourdon tube, bellows, bellows) of the elastic deformation, then the conversion mechanism of table movement will transfer to the pointer pressure distortion caused by pointer rotation to show pressure.

Q: 410 how about the pressure of the pressure gauge?: R-410A temperature see the red mark of the inner ring, the corresponding pressure is the two value of the outer ring, the outer ring is psi pounds, and the second circle is bar,- 1bar=1kgf/cm1psi=6.9kPa (1MPa=145psi)- 1MPa=10kgf/cm1MPa=1000kPaThe pressure corresponds to the temperature chamber. The temperature is known when the pressure is known and can be checked.

Q: The pointer always points to the 0.5bar seismic pressure gauge, can not return to zero, the free end inside the broken? What's the reason then? Is the pressure too great?: Proof above the table generally have a rubber plug, use is to cut with the atmosphere. If you are not cut, long time work, the pressure in the case. When the pressure is released in the form of discharge after the shell pressure, so just. You put a rubber plug off, if not back to zero that is bad.Yes, it's not rubber. It's a small valveThe tables are required to be installed vertically or near vertical and sealed when removed

Q: What is a pressure gauge and how to make it?: 1. Pressure gaugeRefrigerant leakage is a common fault of air conditioning, refrigeration for dose adequacy of detection system, used to the pressure gauge, pressure gauge is a commonly used detection tool of freon refrigeration system, its shell diameter from 60mm to 250mm, a variety of specifications, suitable for air conditioner refrigeration system using a vacuum pressure gauge range to -0.1mpa 2.5MPa, as shown in figure 2-33,The pressure gauge and three way valve repair often supporting the use of clockwise three pass valve knob can make the valve repair, narrow hole, knob clockwise end, corresponding with the outdoor unit piping gas cut off, counterclockwise rotation knob, valve hole expansion, corresponding piping and outdoor group gas conduction, refrigeration system and the three way valve repair pressure gauge has been conducted, has nothing to do with the knob, together with three pass valve repair switch, can realize vacuum pumping, refrigerant filling and test pressure of the refrigeration system, etc..

Q: 250MPa calendar force, 150MPa verification point when the step-up is 148MPa, when the buck is 149MPa, please tell me how to calculate the value of error, return error is how to count? Thank you: Pressure meter return error: under the same conditions, the measured value is constant, the measuring instrument travel direction is different, the absolute value of the difference of its indication value. Note: return error is also called lag error."The return error" and "dead zone": JJF1001 "general terms and definitions for measurement", the term "no return error", but in 7.13 another definition of the term "dead zone" to describe "causing maximum variable interval dynamic measuring instrument in response to changing incentives". Therefore, return error is an index to measure the response characteristics of equipment".Does the return error accumulate? Take the positive and negative rotation of the motor as an example, the return error of the transmission mechanism should not be accumulated once and for all. In other words, back and forth movement many times, return error or fixed interval, does not increase.Application in the motor: the motor itself is no return error, how much encoder reads, how many pulses the stepper motor turns, and the servo system is usually higher than the stepper motor accuracy. The return error is generated by the drive mechanism, such as the screw rod connected on the output shaft of the motor. Therefore, the servo system can accurately control the motor, can't handle the return error. Therefore, the zero bit switch can eliminate zero return error in the course of motion, in addition to the zero power seeking of the incremental encoder. Even if the absolute encoder does not require power on and zero, the photoelectric switch can also be used to eliminate the return error. When there is no return error in the direction of return, it is necessary to set a zero position switch at both ends, so that the motor is backward to zero in this direction, and then the zero is used to measure the movement displacement.

Q: Construction drawings marked life water supply, fire water supply test pressure value of 0.6 and 1.4, respectively, what kind of pressure meter should I choose?: Selection of measuring range1 when measuring the steady pressure, the normal operating pressure shall be 1/3 2/3 of the upper limit of the measuring range of the instrument,2 when measuring the fluctuating pressure (such as the pressure at the outlet of pumps, compressors and fans), the normal operating pressure shall be1/3~1/2 of upper limit of instrument measuring rangeGeneral measurement of pressure gauges, diaphragm pressure gauges and diaphragm pressure gauges should be selected 1.5 or 2.5. level. Pressure gauges for precision measurement shall be of class 0.4, class 0.25 or class 0.16.

Q: What will happen to the calibration process if the calibrator of the pressure gauge is not clean?: Fluctuations resulting in inaccurate calibration of the pressure gauge.

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