(b)Heating valve commonly used on the project

1.2 globe valve

     Is also widely used as a valve. Generally below 100 mm in diameter. Its working principle is similar with the valve, but the closure of parts (valve) moving along the centerline of the valve seat. Play it off line, and may regulate the flow rough.

     Advantages: easy to manufacture, maintenance, convenience, durable.

     Disadvantages: only allows one-way flow of media, the installation direction from time to time. Flow resistance, and poor sealing.

     According to the structure of different sub-straight-through, right-angle type, DC type, balanced. Works generally use straight-through flange (J41H) and the internal thread straight-through processing (J11H). Directional valve, not by anti-. Security should not do.

     In our production and daily life in the past commonly used straight-through processing, small-diameter cut-off valve, it is now gradually being replaced by Ball.

     1.3 Ball valve

     Compared to gate valve, globe valve, ball valve is a new kind of gradually valves are widely used. Its working principle is: a spool for the spherical cavity pass through the valve core stem control for 90 ° rotation, the valve open or occluded. Play it off line role.

     Benefits: In addition to valve, the valve of the advantages, there are a small, sealed well (zero leakage), the advantages of easy-to-use. At present, in the petrochemical, electricity, nuclear power, aviation and aerospace sectors, such as widely used.

     Disadvantages: repairs difficult.

     Ball has two forms: fixed and floating the ball ball. In the heating project, a number of key locations, such as an important branch of the then population of the thermal station, DN250 below ball valve often imported. China ball valve with a different structure: the valve ball valve made generally Type 2, Type 3, the flange connection; while imports of ball valve body is all-in-one, welding connections less point of failure. It is the Nordic country of origin, such as Finland, Denmark and other heating techniques developed countries. Such as Finland, NAVAL, VEXVE, such as Denmark DAFOSS. Due to its excellent sealing performance, operating reliability, long-standing customers well. Non-directional ball valve can be installed at any angle. The level of welding ball valve installed, the valve must be open, to avoid injuries EDM welding spherical surface; when installed in a vertical pipe, if the welding interface, the valve must be open, if the welding under the Interface, valves must be closed so as not to be heat internal burns valves.

     1.4 Butterfly valve

     In the heating system, is currently the most widely used, up to a variety of valves.

     Working principle of: a disc valve, rotating through the stem, valve seat valve in the range of 90 ℃ for rotation, the realization of the switch valve. Play it off line role.

     Advantages: simple structure, small and easy to operate, a good seal.

     Disadvantages: wide-open, the valve plate (seal) the erosion medium.

     In the heating project, use three eccentric butterfly valve metal seal butterfly valve, soft seal butterfly valve rubber.

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