Is the valve stem of the outlet gate valve for the low-temperature pipeline safety valve installed horizontally? ? ?
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Generally, the gate valve in the outlet pipeline of the safety valve should be \"sealed with lead, with the valve stem installed horizontally.\" Horizontal installation prevents the valve disc from falling and blocking the valve, which could lead to the failure of the safety valve’s outlet. ” Furthermore, for low-temperature pipelines, gate valves generally require an extended valve cover to prevent the packing from freezing and being damaged. If the medium is a liquid, the valve stem should be installed vertically to prevent the packing and valve cover from being in contact with the low-temperature liquid for extended periods. There is a problem now. The safety valve of the pump body for low-temperature ethylene product pumps is connected to the top of the ethylene buffer tank. The medium in the outlet pipeline of this safety valve is ethylene; its phase state is likely to be mostly gas with some liquid as well. For the gate valve on it, should the valve stem be installed horizontally or vertically? ? ? Should the drain and vent for low-temperature pipelines be equipped with two valves? ? Chemical Engineering Discussions
Given that ethylene in its medium is mostly in gaseous form with a portion being liquid, it is recommended that the stem of the gate valve on the outlet pipeline of this safety valve be installed vertically, to prevent the packing and valve cover from coming into contact with low-temperature liquid for extended periods. For the drain and venting of low-temperature pipelines, a dual-valve design is generally recommended to ensure safety. .
The gate valve should have its stem installed horizontally. This is the outlet valve of the safety valve; under normal conditions it does not come into contact with the medium, and it only comes into contact with the medium during the operation of the safety valve.
The outlet pipeline of the safety valve is connected to the ethylene product buffer tank; under normal conditions, the fluid in this outlet pipeline is likely gaseous ethylene that has vaporized in the ethylene product buffer tank. But if the liquid in the tank is full, some liquid ethylene should flow back into the outlet pipeline of the safety valve. (I’m not entirely sure if such a working condition will occur.) ）