Contact Yonglong
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Mobile: 15900658318 -
Fax: 021-57568296 -
Email: 1257073858@qq.com -
Address: Nanting Highway, Fengxian District, Shanghai -
2788
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ten 2022-03 Common sense of shut-off valve: selection of pneumatic shut-off valve and types of accessories Introduction to the Technical Manual of the Shanghai Shut off Valve Manufacturer During the use of the pneumatic shut off valve (full name: pneumatic emergency shut off valve), it is usually necessary to configure some auxiliary accessories to improve the performance of the pneumatic shut off valve, or improve the use efficiency of the shut off valve -
thirteen 2022-02 Selection of actuator for pneumatic shut-off valve According to the different field application structures, the pneumatic shut-off valves of Shanghai Yonglong Valve Factory can be divided into single acting (normally closed) cylinder and double acting (normally open) cylinder piston type, which is usually determined by the torque, and the force provided by the double cylinder is greater -
08 2022-01 How to compile the purchase technical specification of shut-off valve The Technical Specification for Block Valve Procurement (SIS Instrument Data Sheet) is prepared based on the technical parameters provided by the actual application on site, so that the valve manufacturer can manufacture emergency block valves that meet the actual needs -
04 2022-01 Difference between normally open actuator and normally closed actuator of pneumatic shut-off valve With the rapid development of science and technology, the continuous improvement of production process and product structure, the use of pneumatic cut-off valve in the field of automatic control system is increasing year by year, and it is widely used in petroleum, chemical industry, paper making, pharmaceutical, water conservancy, power, municipal, steel and other industries -
02 2022-01 Why anti-static design is required for shut-off valve When the pressure of gas shut-off valve and liquid ammonia shut-off valve is lower than PN40, it is usually soft sealed. The anti-static device can discharge static electricity from the valve opening and closing parts to the nature and the earth. Without static electricity, there is no spark, and without spark, there is no fire source needed for combustion -
07 2021-06 Technical parameters and working principle of electromagnetic gas emergency shut-off valve The electromagnetic gas emergency cut-off valve is a semi-automatic safety valve, that is, once the gas emergency cut-off valve is powered on and closed, it will not change with the power on (or power off) state, but will remain in its closed position. The valve can only be returned to the open state through manual operation -
twenty-five 2021-03 Fault position of shut-off valve: principle of air loss open FO air loss close FC The fault position of the pneumatic emergency shut-off valve is generally determined by the customer, and is determined by the customer's pipeline system control mode: air loss open FO - air loss close FC. In case of air source failure, the position of the valve must be complete for the system -
twenty 2021-02 Maintenance and operation of shut-off valve before commissioning The pre maintenance before the operation of the shut-off valve is a very important step, which aims to protect the valve seat sealing device, prevent the valve seat from being damaged during installation, welding and production, and better guarantee the operation of the shut-off valve after production -
03 2021-02 How to maintain the shut-off valve in operation? Valves and various valve parts in operation shall be complete and intact. For example, pneumatic shut-off valve, electric shut-off valve, bolts on flange and bracket are indispensable, threads should be intact, and valve stem sealing gland screws should not be loosened -
01 2020-12 Information of shut-off valve: anti-corrosion measures for emergency shut-off valve The corrosion of emergency shut-off valve is mainly caused by chemical corrosion and spot chemical corrosion. The materials are damaged and deteriorated under the action of various environments. The corrosion of non-metallic materials is generally caused by direct chemical and physical actions
