ZJ,ZJB,ZJC,ZJBC series Roots vacuum pumpDetailed product description：

ZJ, ZJB, ZJC, ZJBC Roots vacuum pump is a type of rotary solid displacement vacuum pump, also known as a mechanical booster pump. It is currently one of the main pumping equipment for obtaining medium and high vacuum. Its working principle is similar to Roots blower, which uses two "8" - shaped rotors to rotate synchronously inside the pump casing to complete suction and exhaust.

The difference between ZJB and ZJBC Roots vacuum pumps with overflow valves and ZJ and ZJC Roots vacuum pumps is that the ZJB and ZJBC pumps have inlet and outlet ports connected, and a self weight valve is vertically installed on the channel to maintain the pressure difference between the exhaust port and the inlet port within a controllable value, which is the maximum pressure difference allowed for reliable pump operation. Therefore, this type of valve is actually an overload automatic protection valve.

ZJC and ZJBC Roots vacuum pumps are the second-generation Roots vacuum pumps independently developed and designed by our company. It has small size, light weight, smooth operation, and low noise. Vertical and lateral flow channels, low leakage rate. Skeleton oil seals and mechanical seals can be freely selected. Inject protective gas into the internal seal to prevent corrosion. Air cooling and water cooling methods can be used to meet different working conditions requirements. The overflow valve of the ZJBC type Roots vacuum pump with overflow valve is a built-in structure, and the appearance is no different from that of the ZJC type.

2、 Purpose:

The ZJ, ZJB, ZJC, and ZJBC Roots vacuum pumps are widely used in vacuum degassing, vacuum melting, vacuum surface treatment in the metal and non-metal materials industry, as well as space simulation in aerospace, low-density wind tunnel testing, and manufacturing of electrical equipment and vacuum freeze-drying equipment. After being configured in series with water ring vacuum pumps and liquid ring vacuum pumps, this pump is more suitable for vacuum polymerization, reaction, decomposition in the chemical industry, and vacuum distillation, vacuum drying, vacuum crystallization and other processes in the food industry.  

3、 Characteristics
1. It can have a large pumping speed in a wide pressure range (1-1.3 × 102 Pa).
2. The pump chamber is oil-free, avoiding oil vapor pollution of the vacuum system.  
3. Low vibration and noise.  
4. The mechanical friction loss is small, so the driving power is low.  
5. Easy to maintain and repair, low cost, long lifespan.  
6. Suitable for sudden deflation of vacuum systems.
7. Can extract condensable gases.  
8. It cannot be used alone and must be equipped with a front-end pump. It is not allowed to start under atmospheric pressure. It can only be started when the inlet pressure of the Roots pump is pumped to the allowable starting pressure by the front-end pump. Pre stage pumps are generally oil sealed mechanical pumps, liquid ring vacuum pumps, such as water ring pumps and oil ring pumps.  
9. Adopting unique processing technology, the parts have good interchangeability.  

Performance parameter model	Extraction rate L/S	Ultimate pressure ≤ Pa	rotation speed rpm	motor		Caliber mm		Weight Kg (excluding motor)	Standard equipped front-end pump model
				model	Power KW
						Import	Export
ZJ-30	thirty	5×10-2	two thousand seven hundred and seventy	Y801-2	0．75	fifty	forty	fifty	2X-4A
ZJB-30								sixty
ZJ-70	seventy	5×10-2	two thousand seven hundred and eighty	Y90S-2	1．5	eighty	fifty	sixty-five	2X-8
ZJB-70								eighty
ZJ-150A	one hundred and fifty	5×10-2	two thousand and nine hundred	Y100L-2	three	one hundred	one hundred	one hundred and seventy	2X-15
ZJB-150								one hundred and eighty-five
ZJ-300	three hundred	5×10-2	one thousand four hundred and fifty	Y100M-4	four	one hundred and fifty	one hundred and fifty	four hundred and fifteen	2X-30A
ZJB-300								four hundred and thirty-five
ZJ-600	six hundred	5×10-2	two thousand and nine hundred	Y132S1-2	5．5	one hundred and fifty	one hundred and fifty	four hundred and fifteen	2X-70A
ZJB-600								four hundred and thirty-five
ZJ-1200A	one thousand and two hundred	5×10-2	one thousand four hundred and fifty	Y160M-4	eleven	three hundred	three hundred	one thousand four hundred and thirty	2X-70A Two units
ZJB-1200						two hundred and fifty	two hundred and fifty	one thousand four hundred and eighty
ZJC-150	one hundred and fifty	5×10-2	two thousand and nine hundred	Y90L-2	three	one hundred	one hundred	one hundred and fifty-five	2X-15
ZJBC-150
ZJC-300	three hundred	5×10-2	two thousand and nine hundred	Y112M-2	four	one hundred	one hundred	two hundred and forty	2X-30A
ZJBC-300
ZJC-600	six hundred	5×10-2	two thousand and nine hundred	Y132S1-2	5．5	one hundred and sixty	one hundred and sixty	four hundred	2X-70A
ZJBC-600
ZJC-1200	one thousand and two hundred	5×10-2	two thousand and nine hundred	Y160M1-2	eleven	two hundred and fifty	one hundred and sixty	eight hundred	Two units of 2X-70A
ZJBC-1200
ZJC-2500	two thousand and five hundred	5×10-2	two thousand and nine hundred	Y160L-2	18．5	three hundred and twenty	two hundred and fifty	one thousand three hundred and fifty	ZJ-600+2X-70A units