Crownwell develops its variable speed screw compressors to be high energy efficiency. At full load, the variable speed compressors will produce the most air using the least energy. Even more important, crownwell will guarantee these efficiencies down to loads as low as 25%. A conventional, fixed-speed air compressor is controlled by a suction control valve that modulates between open and closed positions. But using the suction valve to meet system air demand results in extreme pressure fluctuations and wasted energy, greatly reducing efficiency whenever the compressor operates outside its optimum performance range. Using a frequency inverter and the variable-frequency motor, crownwell compressors deliver the only true variable speed drive. With a true vsd, air is delivered at a constant pressure, regardless of demand, at maximum efficiency. Remarkably, crownwell compressors achieve constant pressure and maximum efficiency across their entire operating range, from 100% loaded down to as low as 25% loaded.

Variable Speed Screw Air Compressor - Belt type
Model	Discharge Capacity (m³ /min)	Discharge Pressure (Bar)	Noise Level dB(A)	Motor Power (KW/HP)	Outlet Connection	Dimension: L× W× H(mm)	Weight (Kg)
CWB-7.5A-VSD	1.20	7	65	7.5/10	1/2”	795× 670× 940	240
	1.10	8
	0.96	10
	0.80	13
CWB-11A-VSD	1.65	7	65	11/15	3/4”	820x700x1050	350
	1.53	8
	1.32	10
	1.10	13
CWB-15A-VSD	2.25	7	65	15/22	3/4”	880x710x1040	420
	2.03	8
	1.82	10
	1.55	13
CWB-18.5A-VSD	3.22	7	65	18.5/25	G1”	1020x800x1190	540
	3.01	8
	2.52	10
	2.30	13
CWB-22A-VSD	3.60	7	67	22/30	G1”	1020x800x1190	610
	3.56	8
	3.07	10
	2.84	13
CWB-30A-VSD	5.20	7	67	30/40	G1 1/2”	1030x860x1320	660
	5.06	8
	4.53	10
	3.90	13
CWB-37A-VSD	6.58	7	67	37/50	G1 1/2”	1140x920x1360	840
	6.26	8
	5.80	10
	5.06	13
CWB-45A-VSD	7.36	7	70	45/60	G1 1/2”	1380x940x1460	920
	7.10	8
	6.47	10
	5.80	13
CWB-55A-VSD	10.8	7	70	55/75	G2”	1400x1010x1660	1350
	10.1	8
	8.50	10
	7.69	13
CWB-75A-VSD	13.5	7	75	75/100	G2”	1635x1080x1830	1620
	12.7	8
	11.3	10
	10.0	13
Variable Speed Screw Air Compressor - Direct coupling type
Model	Discharge Capacity (m³ /min)	Discharge Pressure (Bar)	Noise Level dB(A)	Motor Power (KW/HP)	Outlet Connection	Dimension: L× W× H(mm)	Weight (Kg)
CWD-22A-VSD	3.60	7	67	22/30	G1”	1270x760x1190	730
	3.56	8
	3.07	10
	2.84	13
CWD-37A-VSD	6.58	7	67	37/50	G1 1/2”	1500x930x1380	1020
	6.26	8
	5.80	10
	5.06	13
CWD-45A-VSD	7.36	7	70	45/60	G1 1/2”	1700x950x1350	1210
	7.10	8
	6.47	10
	5.80	13
CWD-55A-VSD	10.8	7	70	55/75	G2”	1720x1000x1520	1450
	10.1	8
	8.50	10
	7.69	13
CWD-75A-VSD	13.5	7	75	75/100	G2”	1850x1080x1660	1820
	12.7	8
	11.3	10
	10.0	13
CWD-90A-VSD	16.2	7	76	90/120	G2”	2200x1260x1750	2200
	15.2	8
	14.3	10
	12.9	13
CWD-110A-VSD	21.6	7	76	110/150	DN65	2330x1300x1850	2450
	20.1	8
	17.5	10
	16.0	13
CWD-132A-VSD	25.2	7	78	132/175	DN65	2400x1320x1820	3150
	24.0	8
	21.0	10
	18.3	13
CWD-160A-VSD	28.7	7	78	160/200	DN80	2760x1550x2090	3580
	27.6	8
	25.3	10
	22.4	13
CWD-185A-VSD	32.5	7	78	185/250	DN80	2760x1550x2140	3850
	30.8	8
	28.2	10
	25.1	13
CWD-220A-VSD	36.8	7	83	220/300	DN80	2900x1550x2100	4400
	34.7	8
	30.8	10
	28.9	13
CWD-250A-VSD	42.7	7	85	250/350	DN80	3100x1550x2195	4600
	40.8	8
	38.1	10
	34.9	13