How to solve the problem of low-temperature valve stuck easily

Low temperature valve installed at room temperature, low temperature work, a wide range of temperature changes. If the design, installation is not easy to generate thermal stress or deformation. At the same time, the operating part of the valve is at room temperature, the circulation part is at a low temperature. In order to reduce the cold loss, the stem often do very long, it is easy to produce deformation and stuck. In this regard, the valve stuck at low temperatures What are the main reasons? 1. Installation, the low-temperature valve and piping configuration is not reasonable and prestress; or pipe cold compensation ability, low temperature valve position changes; or lack of valve bracket, at low temperature deformation; or valve improperly fixed cold box at low temperatures Deformation and affect the valve stem and valve concentricity. 2. In the design, due to the different materials of low temperature valve stem and valve sleeve, linear expansion coefficient is different. General valve stem with stainless steel, linear expansion coefficient of 1.73 × 10-6 ℃ -1; valve sleeve is brass, the linear expansion coefficient of 19.9 × 10-6 ℃ -1, brass shrinkage than stainless steel, low temperature may Biting the thread. Especially when using the dark rod structure and fine thread, the threaded buckle temperature range, thread gap is small, more prone to biting phenomenon. 3. In operation, due to the low temperature valve is not heated thoroughly, or the valve packing at the water, causing freezing at low temperatures, or the valve closed at room temperature too tight, the wire bites and so on. In order to prevent the occurrence of the phenomenon of low temperature valve stuck in the design should adopt the rod structure and rough trapezoidal thread; in the installation should have a solid valve at the bracket to prevent the valve displacement with the valve will be bent. The valve and the cold box can be fixed by elastic connection to prevent valve stem deformation and the valve body is not in the heart; naked cooling period, to check and adjust the valve installed in the cold state, when the valve is found to be stuck after cooling phenomenon , Adjustable valve in the cylinder shell fixed flange, so that the switch freely. In operation, before the start of the heating should be thorough, the valve is closed to the principle of airtight, do not force too much.

Flange Nuts

Here you can find the related products in Flange Nuts, we are professional manufacturer of Large Flange Nuts, Hexagon Flange Nuts, Special Flange Nut, Nylon Lock Flange Nuts. We focused on international export product development, production and sales. We have improved quality control processes of Flange Nuts to ensure each export qualified product.
If you want to know more about the products in Flange Nuts, please click the product details to view parameters, models, pictures, prices and other information about Large Flange Nuts, Hexagon Flange Nuts, Special Flange Nut, Nylon Lock Flange Nuts.
Whatever you are a group or individual, we will do our best to provide you with accurate and comprehensive message about Flange Nuts!

Nuts Screws,Hexagon K Nuts,Open End Rivet Nut,Carbon Steel Flat Head Rivet Nut

Suzhou Gubao Screws Co.,Ltd. , https://www.gbscrewes.com