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Compact Design, Low Noise, Low Vibration, High Efficiency, Low Power Consumption Hori Vacuum Pumps Boast High Market Share, Certified to ATEX Group II, Equipment category 2 (T4) – which makes their use permissable for ATEX 2GD

Based on the characteristic design of swing type, the Hori vacuum pumps feature compact design, low noise, low vibration, high efficiency, and low power consumption. Due to the excellent performance and high durability, the Hori vacuum pumps for hydrocarbon gas recovery apparatuses has gained a domestic market share of approx. 80%.

Features of Hori Vacuum Pumps Include:

1. They are best suited for use as a process vacuum pump.
   The construction of the Hori oil-free vacuum pump is basically the same as that of the Hori oil-free compressor. The gas contact part inside the cylinder is free of oil, thus the circulating gas will not be contaminated with oil.
2. Minimized power consumption
   Any Hori vacuum pump is constructed so that the power consumption is theoretically zero when the suction pressure is at absolute vacuum (-760 mm Hg), with the discharge pressure being at atmospheric one, while attaining a maximum at a suction pressure of -300 to -400 mm Hg, assuming that there is no mechanical loss and the suction and discharge valves operate with no resistance. Thus, in a high vacuum, the operation is performed at an extremely low power consumption, with the valve resistance being significantly reduced.
3. Extremely low noise and vibration
   In vacuum operation, the piston (the blades of the rotor) makes a rocking motion in the vacuum, with no sound being produced in the valves, thus the noise and vibration being held to an extremely low level.
4. Compact and lightweight design
   The piston is moved in a rocking fashion in the cylinder, thus the volume of the cylinder is effectively used. Furthermore, the rotational speed can be set at a relatively high value, which provides the pump body with a compact and lightweight design.
5. Minimum maintenance
   No need for oil lubrication inside the cylinder. Oil in the crankcase is needed to be replaced only once a year, and the seal bar for cylinder sealing enjoys an extremely low wear rate. Thus the maintenance and inspection requirement is held to a minimum.
6. Easy to install
   The Hori oil-free vacuum pump is compact and lightweight, running with practically no vibration, and in addition, it is delivered together with the motor arranged on the same platform, thus the foundation working needed is relatively simple, and the unit can be installed with ease.
7. A single pump can be used for two different functions.
   The same single vacuum pump can also be used under a condition which provides a negative pressure on the suction side, and a positive pressure on the discharge side.
8. Material of gas contact part
   The standard gas contact part is made of a gray cast iron (FC200 or its equivalent) or its equivalent, however, a custom-made gas contact part made of a stainless steel/a stainless steel casting (SUS304/SCS13, SUS316/SCS14, or SUS316L/SCS16) is also available.
9. Shaft seal is available in a variety of types.
   Shaft seal is available in a variety of types to accommodate many different gases and operating pressures. With combustible gasses, such as city gas, and gasoline vapor, Hori vacuum pumps have successfully been operated.

Applications include:

1. Vacuum degassing and recovery
   As can be seen from the figure, the gas which has been sterilized in tank A or the gas which is adsorbed to an adsorbent can be recovered to tank B. The gas can be recovered without being subjected to contamination with such a substance as lubricating oil.
   
2. Degassing and force feed
   The Hori oil-free vacuum pump connected in a circulation circuit can perform vacuum degassing to recover the gas, being used as a vacuum pump, then compress the recovered gas, being used as a compressor operating on the pressure difference across the piping, thus circulating the gas in the circuit under positive pressure.
   
3. Recovery of hydrocarbon gas, organic solvent gas, and inert gas
   When the tank in a gasoline tank lorry is to be filled with gasoline vapor at a gasoline tank location, it must be once evacuated of the residual gasoline vapor. The Hori vacuum pump can be used to recover the residual gasoline vapor for reuse without releasing it to the atmosphere.