Single Station Molding Machine Horizontal molding machine Changzhou Qiaojie Casting Equipment Co., Ltd. , https://www.qiaojieequipment.com
1) The sealing pair consists of a non-metallic soft material and a non-metallic soft material.
2) The sealing pair consists of a metal hard material and a non-metal soft material.
(2) Metal hard seal butterfly valve. The sealing pair consists of a metal hard material and a metal hard material.
3. According to the type of seal (1) forced seal butterfly valve 1) elastic seal butterfly valve. Sealing ratio pressure When the valve is closed, the valve plate squeezing the valve seat, the elasticity of the valve seat or the valve plate is generated. 2) The torque sealing butterfly valve is applied. The seal specific pressure is generated by the torque applied to the valve shaft. (2) Filling the sealing butterfly valve. The sealing ratio pressure is generated by the pressure on the valve seat or the spring seal element of the valve plate. (3) Automatic sealing butterfly valve. The seal pressure is automatically generated by the medium pressure.
4. Classified by working pressure (1) Vacuum butterfly valve. The working pressure is lower than the butterfly valve of the standard atmosphere.
(2) Low pressure butterfly valve. Nominal pressure PN <1.6MPa butterfly valve.
(3) Medium pressure butterfly valve. Nominal pressure PN is 2.5--6.4MPa butterfly valve.
(4) High pressure butterfly valve. The nominal pressure PN is a butterfly valve of 10. 0-80.0 MPa.
(5) Ultra-high pressure butterfly valve. Nominal pressure butterfly valve with PN >100MPa.
5. Classified by operating temperature (1) High temperature butterfly valve. t>450C Butterfly Valves (2) Medium Temperature Butterfly Valves. 120C <t <450C butterfly valve (3) normal temperature butterfly valve. A 40C <t <; 120C butterfly valve (4) low temperature butterfly valve. A 100 <t <a 40C butterfly valve (E) cryogenic butterfly valve. t<a 100C butterfly valve 6. According to the connection classification (1) wafer type butterfly valve.
(2) flange type butterfly valve.
(3) Ear-type butterfly valve.
(4) Welded butterfly valve
1. Classified by structure (1) Center seal butterfly valve (2) Single eccentric seal butterfly valve (3) Double eccentric seal butterfly valve (4) Three eccentric seal butterfly valve 2. According to the sealing surface material classification (1) soft seal butterfly valve.