Pressure Relief Valve

Pipelines used to transport fluid as well as various components of the system must be. Designed to withstand the maximum pressure (Maximum Allowance Pressure, MAP), the value of one if the pressure of fluid in the system is raised. The rise. Pressure can occur in two cases.
1. The source of pressure on the pressure. With increasing pressure.
2. The fluid is compressible in E system, which is caused by the volume of fluid flowing out of less. Than the amount of fluid that flows into the system when the fluid. Higher pressure. G more than a piping system or equipment. Production system that is resistant to the piping system or equipment, they will have to break or explode due to system designers need to be equipped. The pressure from the system when the system pressure exceeds the pressure was off the devices in the system are able to prevent the girl with the normal problems touch with the girl up on the property. Union County and the organism. Equipment used for installation purposes. Prevent over-voltage conditions. (Overpressure) and safety valve (Safety Value), pipes (Vent), the overflow pipe (Over Flow) Rupture Disc and so on.
Safety valve (Pressure Safety / Relief Valve) is a device installed in a piping system used to vent excess pressure from the system. Internal safety valve as shown below. A safety valve when the pressure Of fluid in the system, rather than the pressure of the spring. Customizable built-in safety valve. Pressure of the fluid. Pushes the valve lift of the valve seat, fluid is drained from the system. When the system pressure drop. And the voltage drops below the pressure to win. It's spring in the valve. Pressure valve is down. Turn off the valve seat. Fluid can not drain out. Of the future. In the spring pressure of the safety valve must be set to discharge pressure safety valve. When the pressure exceeds the standards set. Or under the laws of each country is defined as the standard of the American Society of Mechanical Engineers (ASME) imposed on the device, the pressure of burning (Fire Pressure Vessel, ASME I) for example, boiler spent (Boiler) valve. New products will have to drain the excess pressure in the system. (Overpressure) by allowing the formation of the Industry (Accumulated pressure) in not more than 3% of the valves of this type will use the symbol U, the sign of the safety valve.

Conventional Pressure Relief Valves.

Is self-actuated spring-loaded pressure relief valve is controlled by the flow through the nozzle by a movable disc is positioned by spring.
In the case of a vapor, liquid or gas pressure in the vessel close to the set pressure valve may "simmer" before they "pop" and arise because of the fudge over the seating surface to the huddling chamber "B." And it will be. caused an obstruction to flow of fluids between the disc holder and adjusting the pressure will increase in huddling chamber B ring,.

Balanced safety relief valve.
pressure relief valve designed to minimize the effect of back pressure to influence behavior. (Opening pressure, closing pressure and relieving capacity) by using a bellows and balances or reducing the cumulative effect of changing or increasing the back pressure of the safety relief valve discharges in a pipe connected to the output.

ilot operated safety relief valve.

Will be both pop action and modulating action of the valves is appropriate for the system operating pressure close to the valve setpoint (operating pressure).

Diaphragm valve

All kinds of valves mentioned above, it has the disadvantage that it is fluid in the pipe flow is likely to leak out of the skin caused by the different parts of the valve assembly together. (Especially along the stem) in the case of a chemical that is very dangerous. Such leaks are very rare, although it may not be acceptable. In a diaphragm valve which will serve better.

Figure 8, the internal structure of the Diaphragm valve (1) the diaphragm (2) seat.


The diaphragm valve is used to push the diaphragm (1) which is made of a flexible material. (Usually a polymeric material) and press down to attach to the seat (2) below. It closes the valve. When we reduce the pressure to tighten the knots that serves to lift the diaphragm up. The diaphragm plate is lifted with the flexibility of its own. The valve opening. The same principle that a doctor or nurse at the rate of flow of water from contiguous to the patient. He used to squeeze the water hose. (I do not know what yet. If not, it is considered lucky by many).

Diaphragm valves work well with liquids with suspended solids in the mixture. Although the solid residue is located in the valve seat. However, with the flexibility of the diaphragm valve is closed, it can be. But the use of a diaphragm valve of this type can not be used at high temperatures and pressures.


MO Memoir This cast a long, almost the previous 9, then I need it before the next is the subject of the valve to the reverse flow (check valve or non-return valve) and the valve pressure relief (safety valve and relief valve. .)

Pressure Control Valves

Classification of the pressure control valve (Pressure Control Valve).
Pressure control valves can be divided into several types of behavior in high.
Hydraulic, with a different main functions. And purpose of use, but the.

The valve is similar. Is the pressure of the fuel cycle in order to allow the valve to act or work.
This has both direct and indirect control is as follows.

1. Valves limit pressure (Pressure relief valve).
2. Safety Valve (Safety valve).
3. Brake Valve (Brake valve).
4. Valve, the task sequence (Sequence valve).
5. Valve weight control (back pressure, Counter balance valve).
6. Valve discharge an obligation (Unloading valve).