Special attention shall be paid to the following points when selecting the flat gate valve:
First, select the proper valve according to the actual application. For example, single or double gate valves are required for oil and gas transmission pipelines, and rising stem gate valves with guide holes can be selected if pipeline cleaning is required. For product oil transmission pipelines and storage equipment, single or double gate valves without diversion orifices are more appropriate.
Second, consider the material of the valve. Different media have different corrosion, oxidation, abrasion and other properties on the valve. Therefore, proper valve materials shall be selected. For example, for corrosive media such as strong acid and alkali, the valve material with corrosion resistance shall be selected; For severe working conditions such as high temperature and high pressure, the valve material with good heat resistance and mechanical property shall be selected.
In addition, the structure of the valve shall be considered. Different structures have different flow characteristics, operation modes and application scope. For example, the rising stem flat gate valve is applicable to the situation requiring frequent operation or cleaning of the pipeline, while the non-rising stem flat gate valve is applicable to the situation not requiring frequent operation or not easy to clean the pipeline.
When selecting the flat gate valve, pay attention to the following parameters:
Flow coefficient: it reflects the flow capacity of the valve and needs to be selected according to the actual flow demand.
Leakage: the amount of medium leaking outward when the valve is closed. Proper leakage level shall be selected according to actual demand.
Flow characteristics: the flow characteristics of the medium shall be considered, such as whether it contains suspended particles and whether it is easy to scale, etc.
Operation mode: select proper operation modes according to actual demands, such as manual, electric, pneumatic, etc.
Repair and maintenance: consider the difficulty degree of valve repair and maintenance and whether special tools and equipment are required.
In a word, the selection of suitable flat gate valve needs to consider many aspects, including operating temperature and pressure range, structural form, material, driving mode and other parameters. Comprehensive consideration shall be carried out according to the specific application requirements and working conditions to ensure that the flat gate valve can meet the actual needs and play a good role.
