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The working condition of the ND-250(P) diffusion pump depends on the temperature of the working fluid in the pump boiler. During the initial filling, it is recommended to fill the maximum volume of the working fluid. Working fluid is "VACMA OIL 500" vacuum oil (under technical specifications TU 19.20.29-061-00218526-2019). The total amount of working fluid in the ND-250(R) diffusion pump is a maximum of 1.8 liters, a minimum of 1.3 liters. The viewing window for visual inspection of the working fluid has labels of its maximum and minimum amounts. During normal operation of the pump, the level of the working fluid almost does not change. The temperature of the working fluid when the pump is operating at the maximum residual pressure is about 240°C to 255°C. It is recommended to monitor the operation of heaters in the ND-250(R) diffusion pump using the same temperature sensor. The temperature sensor must be installed in a special radiator socket above the heater. If there is a loss of working fluid and an increase in the temperature of the radiators of the pump up to 320˚C, the temperature sensor must give the command to automatically turn off the heaters. The subsequent activation of the pump heaters should not be automatic and should be performed only after cooling the system. Water at the inlet to the cooling systems of the housing and the oil reflector must be supplied with a pressure of 0.3 MPa (3 kgf/cm2) to 0.5 MPa (5 kgf/cm2) and a temperature of plus 4°C to plus 25°C. The recommended cooling water consumption for the housing is 160 l/h, for the oil reflector it is 20 l / h. It is regulated by the outlet water temperature, which should not exceed plus 40°C. The water drain should be free (with a jet break).

The AVDM-100 high-vacuum unit consists of a vacuum diffusion oil-vapor pump, a nitrogen trap, a vacuum gate, a frame or a plate. The principle of operation of the AVDM-100 unit is based on the pumping action of a vacuum diffusion steam oil pump. When the AVDM-100 unit is operating, liquid nitrogen is poured into the trap. Condensation of working fluid vapors occurs on the elements of the freezing device cooled with liquid nitrogen. The frame (plate) is designed for mounting the components of the unit. The ends of the wiring wires are connected to the connector fixed on the plate of the AVDM-100 unit.

The 2NVBM-160(R)/1000 booster pump is a structure consisting of housings, a steam pipe, a trap and a heater. The alignment of the steam line in the 2NVBM-160(R)/1000 pump housing is carried out by a rod inserted into the hole of the hood (oil reflector) and screwed into the upper part of the steam line. The required effective speed of action of the pre-vacuum pump (pumps) at a pressure of 93 Pa (0.7 mm Hg) at the outlet of the booster pump 2NVBM-160(P)/1000 is not less than 15 l/s. The maximum residual pressure of the 2NVBM-160(P)/1000 pump, measured by the PMI-2 manometric ionization converter with nitrogen filled into its trap, is no more than 1.3×10-3 Pa (1×10-5 mm Hg). The pressure of cooling water at the inlet to the 2NVBM-160 pump should be from 0.2 to 0.5 MPa (from 2 to 5 kgf/cm2). The drain from the pump must be free with a jet break. Cooling water consumption is 145 l/h. The total amount of working fluid for the 2NVBM-160(P)/1000 pump is 5 liters., the level of working fluid should be between the upper and lower risks of the level gauge. Replacement or refilling of the working fluid depends on the operating mode of the pump (inlet pressure, pumping duration, etc.) and the composition of the pumped medium, so the time after which the working fluid is replaced or refilled can be 100 hours or more. A large flow rate of the working fluid is observed when the pump is operating in the input pressure range from 1.33 to 13.3 Pa (from 1·10-2 to 1·10-1 mm Hg). The operating mode of the pump in the range from 13.3 Pa (0.1 mmHg) to the maximum residual pressure is cyclically irregular.

The 2NVBM-400(R)/6000 booster pump consists of housings, a steam line, a trap and a heater. The required effective speed of action of the pre-vacuum pump (pumps) at a pressure of 200 Pa (1.5 mm Hg) at the outlet of the booster pump 2NVBM-400(R)/6000 is not less than 45 l/s. The maximum residual pressure of the pump 2NVBM-400(R)/6000, measured by the PMI-2 manometric ionization converter with nitrogen filled into its trap, is no more than 6.6 × 10-4 Pa (5 × 10-6 mmHg). The pressure of the cooling water at the inlet to the pump 2NVBM-400 (R)/6000 should be from 0.2 to 0.5 MPa (from 2 to 5 kgf / cm2). The drain from the pump should be free with a jet break. Cooling water consumption is 600 l/h. The total amount of working fluid for the 2NVBM-400(R)/6000 pump is 47 liters, the level of working fluid should be between the upper and lower marks of the level gauge. Replacement or refilling of the working fluid depends on the operating mode of the pump (inlet pressure, pumping duration, etc.) and the composition of the pumped medium, so the time after which the working fluid is replaced or refilled can be 100 hours or more. A large flow rate of the working fluid is observed when the pump is operating in the input pressure range from 1.33 to 13.3 Pa (from 1 ·10-2 to 1 ·10-1 mm Hg). The pump operating mode in the range from 13.3 Pa (0.1 mmHg) to the maximum residual pressure is cyclically irregular.

The 2NVBM-500/12000 booster pump consists of housings, a steam pipe, a trap and a heater. The required effective speed of action of the pre-vacuum pump (pumps) at a pressure of 200 Pa (1.5 mm Hg) at the outlet of the booster pump is not less than 100 l/s. The maximum residual pressure of the 2NVBM-500/12000 pump measured by the PMI-2 manometric ionization converter with nitrogen filled into its trap, is no more than 6.6 × 10-4Pa (5 × 10-6 mm Hg). The pressure of the cooling water at the inlet to the pump 2NVBM-500/12000 should be from 0.2 to 0.5 MPa (from 2 to 5 kgf / cm2). The discharge from the pump should be free with a jet break. Cooling water consumption 1200 l/h. The total amount of working fluid for the 2NVBM-500/12000 pump is 65 liters, the level of working fluid should be between the upper and lower marks of the level gauge. Replacement or refilling of the working fluid depends on the operating mode of the pump (inlet pressure, pumping duration, etc.) and the composition of the pumped medium, so the time after which the working fluid is replaced or refilled can be 100 hours or more. A large flow rate of the working fluid is observed when the pump is operating in the input pressure range from 1.33 to 13.3 Pa (from 1 · 10-2 to 1 · 10-1 mm Hg). The operating mode of the pump in the range from 13.3 Pa (0.1 mmHg) to the maximum residual pressure is cyclically irregular.

The 2NVBM-630(R)/12000 booster pump consists of housings, a steam pipe, a trap and a heater. The required effective speed of action of the pre-vacuum pump (pumps) at a pressure of 200 Pa (1.5 mm Hg) at the outlet of the 2NVBM-630(R)/12000 booster pump is not less than 100 l/s. The maximum residual pressure of the pump measured by the PMI-2 manometric ionization converter with nitrogen filled into its trap, is no more than 6.6x10-4Pa (5x10-6mm Hg). The pressure of the cooling water at the pump inlet 2NVBM-630(P)/12000 should be from 0.2 to 0.5 MPa (from 2 to 5 kgf / cm2) The discharge from the pump should be free with a jet break. Cooling water consumption 1200 l/h. The total amount of working fluid for the 2NVBM-630(R)/12000 pump is 65 liters, the level of the working fluid should be between the upper and lower marks of the level gauge. Replacement or refilling of the working fluid depends on the operating mode of the pump (inlet pressure, pumping duration, etc.) and the composition of the pumped medium, so the time after which the working fluid is replaced or refilled can be 100 hours or more. A large flow rate of the working fluid is observed when the pump is operating in the input pressure range from 1.33 to 13.3 Pa (from 1x10-2 to 1x10-1 mmHg). The operating mode of the pump in the range from 13.3 Pa (0.1 mmHg) to the maximum residual pressure is cyclically irregular.