PVDF Safety Valve applications PVC Back Pressure Valve kinds PVC Pressure Reduce Valve Installation method

Safety valve is the opening and closing parts under the action of external forces in normally closed state, when the equipment or pipeline medium pressure rise exceeds the specified value, through the system to prevent the discharge of media in the pipeline or equipment medium pressure exceeds the specified value of the special valve. Safety valve belongs to automatic valve class, mainly used in boilers, pressure vessels and pipelines, control pressure does not exceed the specified value, for personal safety and equipment operation plays an important role in protection. The relief valve must be pressure tested before use.

Safety valve is a special branch of valve family, its particularity is because safety valve is different from other valves only play the role of switch, more important is to protect the safety of equipment. With the rapid development of China's economic construction, there are more and more equipment projects with pressure control. In view of the need of equipment pressure relief, PVDF safety valve plays a vital role in the process of protecting equipment. By the end of 2013, there are more than 700 safety valve manufacturers and traders, with more than 200 daily trading inquiries, and the safety valve supply and demand market is heating up obviously. According to preliminary analysis of the first quarter data, safety valve demand is 20 percent higher. Safety valve is an important safety accessory in boiler, pressure vessel and other pressure equipment. Safety valve (also known as pressure relief valve) is automatically opened and closed according to the working pressure of the pressure system (working temperature), generally installed in the closed system of equipment or pipeline protection system safety. When the pressure or temperature in the equipment or pipeline exceeds the set pressure of the safety valve, the automatic start pressure relief or cooling, to ensure that the equipment and pipeline medium pressure (temperature) under the set pressure (temperature), protect the equipment and pipeline normal work, prevent accidents, reduce losses. Safety valve is widely used in steam boiler, liquefied petroleum gas sealed copper safety valve oil and gas truck or liquefied petroleum gas railway tank car, oil well, steam power generation equipment of high pressure bypass, pressure pipeline, pressure vessel and so on. Safety valve is generally divided into spring type safety valve and lever type safety valve and pulse type safety valve according to the structure, of which spring type safety valve is the most common; According to the connection mode, it is divided into threaded and flanged safety valves. Safety valve diameter is generally not large, commonly used in dn15mm-DN80mm between, more than 150mm are generally known as large diameter safety valve. 2013 safety valve industry market scale expansion, this is an indisputable fact. Our country can have resources 

The main role: Safety valve plays a protective role in the system. When the system pressure exceeds the specified value, the safety valve opens, will be part of the system of gas/fluid into the atmosphere/pipeline, so that the system pressure does not exceed the allowable value, so as to ensure that the system is not due to high pressure and accidents

Installation method:Key points for folding Settings，The following points should be noted when setting the safety valve:
(1) The safety valve should be installed in the gas phase part when there are gas and liquid two-phase materials in the container.
(2) When the safety valve is used to discharge combustible liquid, the outlet of the safety valve should be connected with the accident storage tank. When the material released is high temperature combustible, its receiving container should be equipped with appropriate protective facilities.
(3) The general safety valve can be vented on the spot, and the vent should be more than 1 m (m) above the operator and should not face the open fire location, spark location and high temperature equipment within 15 m (m). The safety valve vent of indoor equipment and containers should lead out of the roof and be more than 2 meters (m) above the roof.
(4) when there is a partition valve at the entrance of the safety valve, the partition valve should be in normally open state, and should be sealed to avoid mistakes.

Matters needing attention，Safety valve is a special equipment (boiler, pressure vessel, pressure pipeline, etc.) on the pressure limit, pressure relief plays an important role in safety protection accessories. Safety valve is generally directly installed in special equipment, his design, manufacturing, installation, use, inspection and so on should meet the requirements of special equipment related regulations, because its reliability and performance is directly related to equipment and personal safety, and closely related to energy saving and environmental protection.

A common PVC Pressure Reduce valve generally has the following kinds:

1. According to the overall structure and the form of loading structure, it can be divided into hammer lever safety valve, spring safety valve and control type 3.

2, according to the valve disc type opening height and valve flow diameter ratio can be divided into micro open type and full open safety valve.

3. According to the way of gas discharge of safety valve, it can be divided into fully closed, semi-closed and open type 3

The selection of appropriate safety valve should be considered from the following aspects:

1, the structure of the form, mainly depends on the process conditions of the equipment and the working medium, characteristics. General boiler, pressure vessel discharge is not much use of spring safety valve, otherwise it is better to choose the full open safety valve.

2, if the medium is toxic, flammable and explosive, closed safety valve should be selected

3, each safety valve has its own working pressure range, selection should be in accordance with the actual demand for choice.

4, the selection of safety valve emissions must be greater than the discharge of equipment, so as to ensure that part of the medium is excluded, to avoid pressure continues to rise.

Installation precautions: 

1, all kinds of safety valves should be installed vertically.

2. There should be no resistance at the outlet of the safety valve to avoid compression.

3, the safety valve should be specially tested before installation, and check its sealing.

4, the safety valve in use should be checked regularly

Safety valve for clean, particle-free, low-viscosity fluids. Where the safety relief device must be installed and not suitable for installation of PVC Back Pressure valve place, should install the rupture disc or safety valve and bursting disc in series.

Containers in any of the following conditions must be fitted with safety valves:

1, independent pressure system (with shut-off valve and other systems separate). The system refers to all-phase, all-liquid or gas-phase communication;

2, the pressure of the container is not the source of safety valve occasions;

3, design pressure is less than the pressure at the source of pressure vessels and pipes;

4, positive displacement pump and compressor outlet pipe;

5, due to the accumulation of non-condensable gas container overpressure;

6, furnace outlet pipe if there is a shut-off valve or control valve, upstream of the valve should be set safety valve;

7, due to technical accidents, accident control, power accidents, fire accidents and public accidents caused by overpressure parts;

8, the liquid due to the closure of the valve at both ends of the thermal expansion of the site;

9, condensate steam outlet pipe;

10, in some cases, due to the pump outlet check valve leakage, the pump inlet pipe set safety valve.