Here are two kinds of the rotary vacuum pump: model H single-stage rotary piston vacuum pumps and model 2H double-stage rotary piston vacuum pumps. Rotary piston vacuum pump is a sort of vacuum production equipment suitable for pumping ordinary gases and a little condensable gases (for example, water vapour) with a gas ballast used. The pump must be fitted with appropriate accessories if gas is rich in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil. The pump can be operated singly. It also can be as a backing pump when combined with another high vacuum pump, such as diffusion pump, oil booter vacuum pump and roots vacuum pump. Series rotary piston vacuum pump can be used for a longer time than the sliding vane rotary vacuum pump. It is widely used in vacuum coating, vacuum heat treatment, vacuum sintering, molecule distilling and simulation testing, etc.

Features:
●Low vibration, low noise by optimizing design and matching weigh
●Supply oil singly to baring seal house, because the baring seal house and the pump house is be fenced out, it is avoided that the impurity come into the baring seal house, that beget the baring and seal to be shattered prematurely.
●According as the consumer requisition, the subsidiary oil box can be equipped, it can make the oil cooling and the impurity separating.
●The motor is on top of the pump besides the old model H-150. Compact structure, fewer dimension control clearance.

Model H、2H pump main performance-parameter table

Model	Ultimate pressure (Pa)	Pumping speed (L/S)	Power (KW)	lnlet & outlet dimensions (mm)		Cooling water supply (Kg/h)	Weight (Kg)
				lnlet	outlet
2H-8	6x10-2	8	1.1	50	32	風冷	100
2H-15		15	2.2	65	32	風冷	140
2H-30A		30	4	63	50	135	295
2H-70C		70	7.5	80	76	350	630
2H-100		100	11	100	80	500	850
H-150	1	150	15	150	80	800	1100
H-25		25	2.2	50	40	風冷	340
H-50		50	5.5	80	50	480	350
H-70B		70	7.5	80	76	315	450
H-100		100	7.5	80	63	300	615
H-150		150	15	150	80	700	720
H-150L	1.3	150	15	150	80	700	680
H-150D		150	15	105	80	450	896
H-200		200	15	100	80	700	1000
H-600		600	35	250	150	2800	3200

Explain：1、1401*、H-7*、H-8A* are old pump
2、Hereinbefore,ultimate pressure is partial ultimate pressure that is measured by compression gauge.