(c)Heating valve commonly used on the project

1.5 Check valve

     Also known as check valve, single-stream doors. A commonly used valves play a supporting role.

     Working principle: to rely on its own strength as well as the fluid valve of self-respect, automatic gate valve. As the name suggests, its role is to prevent the media back. Generally installed in the export pumps to prevent water hammer damage to the pump.

     Commonly used in heating projects have the level of take-off and landing type (H41H), Single Swing (H44H), double valve butterfly (H77H).

     Directional non-return valve must not be anti-loaded. Different forms of non-return valve, according to their structure, have a fixed installation, must not be installed wrong. The level of jack-up can only be installed in the horizontal tube on the road, and ensure the valve in a vertical state; Single Swing can only be installed in the horizontal tube on the road, and ensure the valve shaft at the level of state; double butterfly valve can be installed.

     1.6 Control Valve

     Also known as throttle. Secondary heating system is a network of valves used.

     Working principle of: shape, structure and a similar cut-off valve. Vice different is sealed, the valve control valve similar to valve and valve seat of the cork and bottle vacuum bottle, through the movement of valve area changed to regulate the traffic flow. In the valve axis, said there is a corresponding flow gauge.

     Role: regulating the distribution of pipe flow between the media in order to achieve thermal balance.

     Heating projects have been using a straight-through processing (T41H), but it has some shortcomings: flow resistance, and should not be mounted vertically. So as technology advances, balance valve (PH45F) instead of regulating valve.

     1.7 Valve

     Improved control valve. DC-type flow, PTFE valve seat changed;

     Overcome the shortcomings of large flow resistance, while two additional advantages: a more reasonable seal, both cut-off function.

     Thermal heating station project in the second-line use, with excellent flow regulating characteristics, especially suitable for variable flow systems.

     Directional, can be installed level can also be mounted vertically.

     1.8 Self-Balance Valve

     Also known as flow control valves. Its working principle is: there is a valve spring and rubber membrane body, which connect with the stem. If the flow increases, resulting in an imbalance in its power, the valve moving to shut down in order to reduce the flow area to reduce the flow, so that the return flow settings. And vice versa. This has always been to maintain the same flow after valve to control flow purposes.

     Heating system installed in the thermal population, branch point. Automatic elimination of hydraulic imbalance, improve system performance, the realization of economic operation. Self-directional balance valve not installed anti-.

     In addition, there is the use of environment on corrosion and protection of the valve problem, medium on the valve's internal corrosion and protection issues, as well as temperature and pressure sealing and leakage problems. In short, the valve is small, a lot of learning to be for us to summarize continuous learning.

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