Steel structures / | Control and shut-off valve: a few words about terminology |
Not every private developer can communicate « on equal terms » with engineering and technical personnel of enterprises, specializing in the installation of pipelines. Special slang used by experts, not always understood by the simple inhabitant. In order to avoid misunderstandings in the paper prepared by the company « », Armmetall briefly explain the meaning of a number of terms used by technicians, as well as the issues of buying a new and previously operated equipment.
Pipe fittings
What is different valves from the water valve or gas tap? It turns out, nothing: it is an umbrella term that denotes the device (or set of devices) to overlap, redirect, or adjust the mixing fluid (liquid or gas). Thus, under this definition, it is understood a group of devices with different design and purpose: valves, taps, valves, valves, steam traps and regulators. Below — Some classification signs by which any layman can understand the difference between the tap and the valve, and the valve gate.
Appointment
The main classification sign — purpose: on the basis of pipe fittings are divided into a number of the following technical means.
- Valves — devices for stopping the flow of the working environment.
- Regulatory — device with which you can change the parameters of the working environment.
- Safety valves — equipment, automatically triggered in excess of a predetermined value or when you change the characteristics of the work environment (the so-called subversive valves, etc.)
- Distributive mixing is used to change the direction of flow or mixing of several fluid streams.
Operating principle
The same operation — overlapping of adjustment, mixing — It can be performed using a variety of equipment. To avoid confusion, standard documentation divides the pipe fittings on a number of classes. For example, the valve — a kind of shut-off valves, in which the working body (sleeve) prevents flow of gas or liquid perpendicular to their direction of motion; while the sleeve is moved back and forth. In most cases the valve is used only to stop the flow, is used to adjust other devices. The valve actuator (valve plate) moves parallel to the flow; the principle of operation is based on the rotation of the crane working body and the shutter — on the change in the geometry section of the passageway.
What to prefer:/used or new?
Often, the developer is faced with a choice: to buy new equipment or to apply to a company that specializes in sales b/y-pipe and fittings? To answer this question clearly can not be in spite of the profitability of the acquisition previously used devices such purchase fraught with a certain degree of risk, and at the same time, promises a considerable savings.
Everything can be solved on the basis of the technical condition of the equipment and its value: if the sale of pipes b/u accompanied by a demonstration of devices with a high degree of wear and corrosion damage, the equipment is better not to buy — it does not last for long. At the same time it is worth noting that often the warehouses of the so-called business of metal pipes can be found in perfect condition. In any case, we recommend that you discuss now engaged in the sale of used pipes/have the opportunity to return and win the support of specialists « Armmetall ».