Relying on a suitable gas circulation inherently controlled by a cooler fitted outside, the series ZJQ roots pumps can be operated continuously for over-coming very high pressure differential without being overloaded.
Also can be operated with its exhaust pressure atmospheric gas. They own excellence of the general roots pump. They can be operated singly, also can be operated combining with backing pump.
When the pump is operated singly, the exhaust pressure atmospheric gas can cool the pump and a cooler is unnecessary, an ultimate pressure of approximate 130hpa at the inlet side can be attained.
The series ZJQ roots pumps can be operated in series and also be operated combining with normal roots pumps to make they bring feature of clean pump housing into full play. They can also be combined with backing pumps such as liquid ring pumps or rotary piston pumps to make themselves have a higher pumping speed near main pump even in higher pressure range and get different ultimate pressures from 105pa to 5×10-5pa.
Because of their high capacity, the series ZJQ roots pumps are widely used in many engineering fields requiring to be exhausted rapidly and low ultimate pressure or requiring to be exhausted cleanly and no oil pollution.

Model ZJO pump main performance-parameter table

Model	Pumping speed (L/S)	Ultimate pressure		Maximum permissible dfferent pressure (Pa)	inlet&outlet diameter (mm)	compression ratio with zero throughput	range of motor power (Kw)	recommended rotating Seed (r/min)
		Single pump (Pa)	With backing pump
ZJQ-30	30	2x104	不同配比 可獲得 105Pa~5 x 10-2Pa	8x104	63	25	0.75~5.5	3000
ZJQ-70	70	2x104		8x104	80	25	1.1~11	3000
ZJQ-150	150	1.6x104		8x104	100	30	3~15	3000
ZJQ-300	300	1.6x104		8x104	160	30	4~30	1500
ZJQ-600	600	1.6x104		8.7x104	200	35	7.5~55	1500
ZJQ-1200	1200	1.6x104		8.7x104	250	35	11~132	1500
ZJQ-1800	1800	1.3x104		8.7x104	320	40	15~200	1500
ZJQ-2500	2500	1.3x104		8.7x104	400	40	18.5~250	1000
ZJQ-3750	3750	1.3x104		8.7x104	400	40	30~355	1500
ZJQ-5000	5000	1.3x104		8.7x104	500	45	45~375	1000
ZJQ-12000	12000	-		2.0x104	500	45	75~280	1000

Model	L	L1	L2	L3	L4	b	b1	b2	h	h1	h2	h3	s	K	D	D1	D2	d	d1	d2	m	n
ZJQ1500	210	410	330	72.5	60	370	310	210	385	25	165	205	42	18	100	145	165	63	110	130	8-M8	4-M8
ZJQ300	280	510	415	90	80	520	440	275	470	30	168	250	50	18	160	200	225	100	145	165	8-M8	8-M8
ZJQ600	390	650	520	140	100	560	650	335	600	40	235	320	60	22	200	260	285	100	145	165	12-M10	8-M10
ZJQ1200	480	485	745	180	130	780	650	450	750	30	270	400	75	25	250	310	335	160	200	225	12-M10	8-M10
ZJQ1800	730	610	870	305	130	780	650	450	750	30	270	400	75	25	250	310	335	160	200	225	12-M10	8-M10
ZJQ2500	780	880	1040	290	170	1160	1060	590	1060	60	390	560	100	28	400	480	510	160	200	225	16-M12	8-M10
ZJQ3750	780	880	1040	290	170	1160	1060	590	1060	60	390	560	100	28	400	480	510	160	200	225	16-M12	8-M10
ZJQ5000	975	880	1140	290	200	1320	730	590	1320	90	485	695	125	34	500	580	610	200	200	285	16-M12	8-M10