What is the difference in installation direction between globe valves and gate valves?

Generally, gate valves can be installed in any direction, while globe valves should be installed with flow from low to high, or according to the direction indicated on the valve.

The installation direction of globe valves and gate valves is clearly indicated on the valve body

It’s fine to take a closer look at the valve section in the chemical engineering process manuals! Understand its principle. Actually, you just need to press it to find out the direction of the stop valve. The main thing is to know what function this thing has when pressed! Why add this!

In some cases, the installation direction of a globe valve requires it to be installed in reverse, that is, with fluid flowing from high to low. There are generally several situations in which this reverse installation is necessary: (1) For high-pressure globe valves with a diameter greater than 100 mm, the flow direction is from high to low. Due to the poor sealing performance of valves with large diameters, this method is used so that, when the valve is closed, the pressure of the fluid acts on top of the valve disc, thereby enhancing the valve’s sealing efficiency. (2) For the two check valves connected in series on the bypass pipeline, the flow direction of the second check valve should be from high to low. To ensure the tightness of the valves over a maintenance cycle, valves that are operated frequently need to be equipped with two check valves in series. For bypass systems, the function of this bypass is as follows: ① To balance the pressure before and after the main pipeline valve, thereby making it easier and less labor-intensive to open the valve and reducing wear on it ； ②Low-flow pipe warming during startup ； ③On the main feedwater pipeline, the feedwater flow rate is controlled to regulate the boiler’s pressure rise rate during the boiler hydrostatic test. The bypass shut-off valves in the direction of medium flow are referred to as the primary valve and the secondary valve. When the unit is operating normally, both the primary valve and the secondary valve are closed, and they are in direct contact with the medium. To prevent the gasket between the valve body and the valve cover of the secondary valve, as well as the packing around the valve stem, from being exposed to the medium and temperature over extended periods, and to enable the replacement of the valve’s packing during operation, the secondary valve requires to be installed with the flow direction being \"from high to low\". (3) Boiler exhaust and relief stop valves also have a flow direction of \"from high to low\"; these valves are used only during the boiler’s startup and water filling process, with a low frequency of operation. However, poor sealing often leads to losses of fluid. Therefore, some power plants install such stop valves with the flow direction \"from high to low\" in order to improve their sealing performance. (4) Other situations where it is required that the check valve operate in a “high in, low out” direction: In biological, pharmaceutical, and microbial fermentation processes, the check valves located at the end of the pipes connecting to the fermentation tanks and seed tanks are installed to allow flow in a “high in, low out” direction. Installing it in this way places the more airtight end of the valve closer to the tank; when the valve is closed, the material inside the tank does not come into contact with the valve stem, preventing contamination due to leaks from the valve stem packing. This ensures thorough sterilization when steam is used for pipeline cleaning and disinfection. (5) The flow direction of the solenoid quick-shut valve on the fuel line is \"high in, low out.\" The function of the solenoid quick-shut valve is to close quickly, thereby shutting off the fuel supply promptly. The structure of the electromagnetic quick-stop valve is similar to that of a globe valve; if fluid enters the electromagnetic quick-stop valve from below and exits from above, the force exerted by the fuel on the lower part of the valve disc is very large, whereas the weight of the plunger in such a valve is much smaller than this force. Therefore, if the working fluid enters the quick-cut valve from below, the torque generated by the weight is less than the torque generated by the fuel pressure; as a result, the fuel cannot be cut off when the quick-cut valve operates, and thus the intended purpose cannot be achieved. If the working fluid enters from above the quick-acting valve, once the valve operates, the pressure behind it drops rapidly; as a result, the force exerted by the fuel on the lower part of the valve disc drops to zero almost immediately. The force exerted by the fuel on the valve disc, combined with the torque generated by the weight of the weight and the lever, causes the valve disc to close quickly. Therefore, the quick-break valve requires \"high inlet and low outlet\".

The person on the sixth floor is right. I would like to ask whether there are any relevant standards?