Safety valves are important safety accessories on special equipment, and their installation also has corresponding requirements. Here are some common items:
1. For boilers with rated evaporation greater than 0.5t/h, install at least two safety valves: boilers with a rated evaporation of less than or equal to 0.5t/h, at least one safety valve. Safety valves must be installed at the outlet of the separable economizer and at the outlet of the steam superheater.
2. The safety valve should be installed vertically in the high position of the boiler and the box. Between the safety valve and the drum or header, the outlet pipe and valve for steam should not be installed.
3. The lever type safety valve shall have a device for preventing the weight from moving by itself and a guide frame for restricting the deviance of the lever. The spring type safety valve shall have a device for lifting the handle and preventing the adjustment screw from being twisted.
4. For boilers with rated steam pressure less than or equal to 3.82 MPa, the safety valve throat diameter should not be less than 25 mm: For boilers with rated steam pressure greater than 3.82 MPa, the safety valve throat diameter should not be less than 20 mm.
5. The connecting pipe of the safety valve and the boiler shall have a cross-sectional area not less than the inlet cross-sectional area of ​​the safety valve. If several safety valves are installed together on a short pipe directly connected to the drum, the cross-sectional area of ​​the short pipe should not be 1.25 times that of all safety valves.
6. Safety valves should generally be equipped with exhaust pipes. The exhaust pipes should be straight to a safe place and have sufficient cross-sectional area to ensure unobstructed exhaust. The bottom of the safety valve exhaust pipe should be filled with a drain pipe that is connected to a safe place, and no valve is allowed on the exhaust pipe and the drain pipe.
1. For boilers with rated evaporation greater than 0.5t/h, install at least two safety valves: boilers with a rated evaporation of less than or equal to 0.5t/h, at least one safety valve. Safety valves must be installed at the outlet of the separable economizer and at the outlet of the steam superheater.
2. The safety valve should be installed vertically in the high position of the boiler and the box. Between the safety valve and the drum or header, the outlet pipe and valve for steam should not be installed.
3. The lever type safety valve shall have a device for preventing the weight from moving by itself and a guide frame for restricting the deviance of the lever. The spring type safety valve shall have a device for lifting the handle and preventing the adjustment screw from being twisted.
4. For boilers with rated steam pressure less than or equal to 3.82 MPa, the safety valve throat diameter should not be less than 25 mm: For boilers with rated steam pressure greater than 3.82 MPa, the safety valve throat diameter should not be less than 20 mm.
5. The connecting pipe of the safety valve and the boiler shall have a cross-sectional area not less than the inlet cross-sectional area of ​​the safety valve. If several safety valves are installed together on a short pipe directly connected to the drum, the cross-sectional area of ​​the short pipe should not be 1.25 times that of all safety valves.
6. Safety valves should generally be equipped with exhaust pipes. The exhaust pipes should be straight to a safe place and have sufficient cross-sectional area to ensure unobstructed exhaust. The bottom of the safety valve exhaust pipe should be filled with a drain pipe that is connected to a safe place, and no valve is allowed on the exhaust pipe and the drain pipe.
Product Dimesnion: 5.7" x 3.7" /14.5cmx9.5cm
Mask Fabric Material: 3-ply material,100% polypropelyne
Ear Loop Material: 70% polyamide, 30% elastane
when to use: suitable for kids to use daily in a variety of settings such as home, outdoors and school
packaging: 10 pcs of mask in one sealed printed plastic bag to ensure hygiene or 50ps per box
certification/standard: GB/T 38880-2020(China children disposable mask standard) and FDA registered
about the manufacturer: Kapanou is china-based healthcare company
Civil Disposable Kids Face Mask, Disposable Kids Mask FDA GB/T 38880-2020, 3-ply Disposable Kids Mask
Ningbo Debeida Science&Technology Co.,ltd. , https://www.dbdmask.com