The safety valve in the system play the role of security protection. When the system pressure exceeds the set value, the safety valve open, part of the system in the gas / fluid into the atmosphere / pipeline, the system pressure does not exceed the allowable value, thus ensuring the system is not an accident due to excessive pressure.
Hammer lever safety valve is to balance the role of the force on the valve using a heavy hammer and a lever. According to the lever principle, it can use smaller hammer quality for a larger force by the lever increased, and by moving the position of the hammer (quality or transform weight) to adjust the safety valve opening pressure.
Hammer lever safety valve has the advantages of simple structure, easy adjustment and accurate, the increase of load will not increase while the valve of a larger increase, suitable for high temperature, the past used more widely, especially used in the pressure vessel and the higher the temperature of the boiler. But the structure of safety valve hammer lever relatively bulky, easy loading mechanism vibration, and often leak due to vibration; the back seat pressure is low, after the opening is not easy to close and keep tight.
The safety valve before the factory, should be the setting value by Taiwan to adjust the opening pressure to the user's requirements. If the user make the spring working pressure level, according to the general should be according to the lower limit value of the pressure level adjustment of the factory.
In the users will be protected safety valve installed on the device before or during installation, you must re adjusted at the installation site to ensure the safety valve set pressure value to meet the requirements.
In the nameplate indicating the spring working pressure level range, by rotating the adjustment screw to change the amount of spring compression, you can adjust the pressure on the opening.
And before the rotation adjustment screw, valve inlet pressure should be reduced to open the pressure below 90%, to prevent the rotation adjustment screw to be driven when the disc rotation, which damage the sealing surface.
And in order to ensure the accurate value of opening pressure, should make adjustments in the medium conditions, such as medium type, temperature as close as possible the actual operating conditions. Media types to change, especially when the state does not accumulate while the media (such as from a liquid to a vapor), open the pressure changes often. Temperature increases, the opening pressure is generally decreased. The adjustment for high temperature at room temperature, room temperature setting of the pressure value should be slightly higher than the required opening pressure value. To what extent the high structural and material selection and the valve has a relationship, should be based on the manufacturer's instructions.
The conventional safety valve for a fixed additional back pressure of the occasion, when adjusting the opening pressure in the inspection after (when back pressure is atmospheric pressure), the setting value should be value minus the value of additional back pressure pressure is required to open.
Hebei Shanghan Import&Export Trade Co., Ltd is one of the Chinese promising companies. It is a young company whose business operations cover a broad spectrum of international trade activities and equipment manufacturing and supply. Our factory built in 2004, it is located in the southeast of Hengshui.
Hebei Shanghan Import&Export Trade Co., Ltd serves as China's largest supplier of camping house and petroleum equipment, holding a dominant position in domestic petroleum equipment accessories. At the same time, Hebei Shanghan Import&Export Trade Co., Ltd is also a major supplier of refined oil products and petrochemicals. As one of the largest service suppliers in the global petroleum and petrochemical industries, Hebei Shanghan Import&Export Trade Co., Ltd can also provide operational services and technical support in such areas as geophysical prospecting, well drilling, logging, well testing, downhole operations, oilfield surface facilities construction, pipeline construction, refining and petrochemical projects, and manufacturing and supply of petroleum equipment.
By the end of 2012, there were 20 overseas exploration and production projects in 12 countries or areas such as Saudi Arabia, American, England, Kuwait, Libya, Iraq, Kazakhstan, Turkmenistan, Mexico, Russia, Venezuela, and Iran etc.
