Without a doubt, tank equipment is the basis of safe operation of the reservoir system.In turn, one of the brightest representatives of this type of equipment, of course, are "breathing" means, among which a special role appears to be discharged breathing valve type CDS.
Breather DPT is a rather complex mechanical device, the main purpose of which is determined by the function of adjusting the pressure of steam, gas and air pollution generated as a consequence of the evaporation product in the vertical tank, in order to prevent its destruction.There are at least two types of breathing valves type DPT - DPT DPT-3000 and-1500.The difference between these types lies in their technical and operational characteristics and bandwidth.For example, if breathing valve type CDS-3000 generally intended for mounting on vertical tanks of large capacity (10,000 cubic meters), the type of CDS-1500 - a tank for smaller volumes (up to 10,000 cubic meters).Although, of course, in the end everything is determined in accordance with the Design Institute developed the technical and operational documentation to the corresponding reservoir system.It should also be noted that the above types of valves, in turn, have their own internal grading, differing in size and conditional steam-gas-air mixture (Dn).For CBC-3000 - it is 250, 350 and 500 mm, while for CDS-1500 - is 150, 200, 250, 350 and 500 mm.
Despite a number of significant differences (including dimensions), the main components of the valve and kind of KDS-3000 and the type of KDS-1500 are similar.Among them stamp-welded housing (varies by design features depending on the type, manufacturer, and modification) which has the seat for the vacuum valve, themselves, vacuum valves, consisting of a tray vacuum and PTFE strap, fastening is carried out to the valve body and therebylimiting the displacement of the plates vacuum relative to the seat, plate pressure, performs the functions of the release of steam-gas-air mixture, PTFE film provides not freeze in cold weather contacting surfaces, the cover providing protection from rain, flame arrester (made according to the required diameter).
In addition, similar to the principle of work of these two species ("take a breath").
In implementing the "inspiration" in the oral airway valve creates a vacuum on the value equal to the vacuum in the tank.Upon reaching the calculated values of vacuum (namely, vacuum actuation) into the cavity vent valve opens the vacuum gate plates by combining the gas space of the tank with the ambient air, thereby providing a pass air mixture into the tank.Accordingly, when the vacuum pressure is lowered to the calculated values, the shutter is closed, sealing the tank.
When "exhalation" in the body cavity vent valve created
excessive pressure on the value equal to the pressure in the gas space of the tank.Thus, the pressure plates clamp carries vacuum valves to the respective saddles and simultaneously acts on the pressure plate, trying to pick it up.With increasing excess pressure in the housing to vent valve actuation value, the pressure plate is opened, allowing the release of the vapor-gas-air mixture from the tank to the atmosphere.Accordingly, after pressure from falling below the calculated values of the plate back to the starting position (closing the shutter).
Install vent valves of these species is carried out by means of attachment using fasteners (hardware) to the mounting pipe welded into the tank.
With proper care (follow the operating instructions and maintenance) average service life of respiratory valves kinds of KDS-3000 and PDR-1500 is at least 10 years.
