GENERAL CATALOGUE API

Introduction General technical information

Volume in normal conditions The following are considered normal conditions of the fluid: temperature °K = 273 + 20°C, pressure = 1 bar. For the following considerations, the equation of state of perfect gases is also accepted as valid for the actual air gas. This is: PV = nRT where P = absolute pressure of the gas [ bar ] V = volume [ m 3 ], T = absolute temperature [ °K ], Assuming that we wish to bring a given volume of air V1, subject to pressure P1 and temperature T1 back to the normal conditions P0, V0, T0. We can say that the situation will pass from P1V1 = nRT1 to P0V0 = nRT0. Therefore, P1V1/T1 = P0V0/T0, from which it follows that: V0 = (P1/P0) x (TO/T1) In normal conditions volume is directly proportional to the pressure ratio and inversely the temperature ratio. As the latter are expressed as 273 + °C, the influence of their ratio is negligible, consequently we normally consider: V0 = (P1/P0) x V1 [ Nm 3 ].

Table of symbols

Symbol

Meaning

Symbol

Meaning

Symbol

Meaning

Double acting magnetic cylinder (piston - mobile equipment)

Single acting cylinde spring return

Compressor

Conditioning unit F.R.L. (filter, regulator, lubricator)

Vacuum pump

Double acting cylinder

Pneumatic motor with one direction of rotation

Double acting cylinder with permanent magnet

Filter

Double acting cylinder with dampers at both ends

Pneumatic motor with two direction of rotation

Manually operated water separator

Pneumatic motor with one direction of rotation and variable displacement volume

Double acting cylinder with adjustable cushionings at both ends

Water separator with automatic drain

Pneumatic motor with two direction of rotation and variable displacement volume

Filter with water separator (with automatic drain)

Single acting telescopic cylinder

Double acting telescopic cylinder

Rotary cylinder

Air dryer

Single acting cylinder with return by external force

Double acting cylinder with through rod

Lubricator

II.2