9, demand in the flow control, can choose the worm gear and worm drive, pneumatic or electric belt type V mouth adjust needle valve. 5, the low temperature medium pipeline system and device, appropriate chooses combined with low temperature type needle valve bonnet. 6, the pipeline system of catalytic cracking of the play device of the refining units, up and down rod type needle valve is optional. 8, smelting metal system, power system, the stone play device, the urban heating system in the medium of high temperature piping system or device, can choose a metal to metal tightly closed type needle valve. 3, urban liquefied petroleum gas and natural gas pipelines, selection of signatures and turnbuckle petition type needle valve. Otherwise requirements or changes, such as the following should be explained in order contract understand: 1. The valve specifications ( Class system valve expressed in inches. Metric valve expressed in mm) 2. Pressure levels or nominal pressure 3. 4 flange size and tightly closed surface period way. The weld end and aperture Marine valve 5. Interrupting and turnbuckle size 6. Structure length of seven. 8 refractory, antistatic device. Demand for worm gear transmission, pneumatic or electric 9. Demand for locking structure, whether you will lock 10. Materials ( Cover the main body, the valve stem, fasteners, etc. ) 11. Gasket 12. Packing 13. Tightly closed surface material match ( Spherical stereo tightly closed surface and seat tightly closed surface) 14. The other. 2, product oil pipeline and storage facilities, signatures of the needle valve type selection. 4, oxygen in the smelting metal system trachea, road system, appropriate chooses through strict degreasing treatment, flange type signatures of the needle valve. Q: needle valve type selection is suitable for use of the principle of answer: 1, director of fuel, natural gas transmission line, needs a thorough cleaning of pipeline, and to be buried in the ground, selection of full size, smoke type welding structure of the needle valve; Buried in the ground, pick out full size or flange welding adjacency department signatures of ball valve. 7, chemical systems, such as acid and alkali corrosive medium device and pipeline system, appropriate chooses the austenitic stainless steel, ptfe seat tightly closed circle type stainless steel needle valve. Notes to the order: The national standard) A, A: B: product name, model, nominal size medium and temperature, pressure range C: whether there is attachment, delivery time, and special requirements so that we can correct selection for you. Second, if the valve has been selected by design unit of our company model, please order according to the valves parameters directly with our sales center. Three, it is very important when you use the occasion or the environment is more complex, would you please provide design drawings and detailed parameters, our engineers experts will concentrate on review and analysis for you. We can provide you with professional solutions, including design, customization, complete, operation and service. We've been working on the valve leader in the field of industry, to provide you with the latest knowledge of the valve, the best service, best technical adviser. Thank you for visiting our website, if you have any questions, you can call us, we will be dedicated to provide you with quality services. The factory provides professional ball valve, butterfly valve, gate Industrial Valves, globe valve, check valve, relief valve, safety valve, Marine valve, oil valve, hydraulic control valve and other kinds of valves.
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