Hard Seal Butterfly Valve
Butterfly Valve hard seal refers to: Both sides of the sealing pair are metal materials or hard other materials. The sealing performance of this seal is poor, but high-temperature resistance, anti-wear, good mechanical properties. Such as stainless steel, cast iron, cast steel, alloy steel and so on. The hard seal has a long service life, but the tightness is poor compared with the soft seal.
Available in electric hard seal butterfly valve and pneumatic hard seal butterfly valve for your choice.
Soft Seal Butterfly Valve
Butterfly Valve soft seal refers to sealing pair on one side is metal materials, the other side is elastic non-metal materials. The sealing performance of this seal is good, but not resistant to high temperature, easy to wear, poor mechanical. NBR, EPDM, Viton and PTFE.
Soft seat with a certain strength, hardness and temperature resistance of non-metallic materials make seal, good performance can be made to zero leakage, but life and temperature, adaptability is poor. For example, PTFE has a maximum temperature of 180 °C
The advantage of soft seal is good sealing performance, the disadvantage is easy to aging, wear and tear, Short service life.
Available in electric soft seal butterfly valves and pneumatic soft seal butterfly valves.
The Main Structural Differences Are As follows 5 Points:
1. Structural Differences
Soft Seal Butterfly Valve is more linear, hard seal is more single eccentric, double eccentric, triple Eccentric Butterfly Valve.
2. Heat Resistance
Soft seal used in room temperature environment. Hard seal can be used in low temperature, normal temperature, high temperature and other environments.
3. Pressure
Soft seal low pressure-atmospheric pressure, hard seal can also be used in high pressure and other working conditions.
4. Sealing Performance
Soft seal and three Eccentric Hard Seal Butterfly Valve sealing performance is better. Triple Eccentric Butterfly Valve can maintain a good seal under high pressure and high temperature.
5. Anti-corrosion Property
Soft seal can only withstand mild corrosive media, but the hard seal with a strong anti-corrosion type, can withstand most of the corrosive media.
In view of the above characteristics, soft seal butterfly valve is suitable for ventilation and dust removal of the two-way open and close and regulation of the pipeline, water treatment, light industry, petroleum, chemical and other industries. Hard seal butterfly valve is used for heating, gas, and gas, oil, acid, alkali, and other environments.
With the wide use of butterfly valve, it’s easy to install, easy to maintain, simple structure of the more obvious features. Electric soft seal butterfly valve, pneumatic soft seal butterfly valve, hard seal butterfly valve in more and more occasions began to replace electricity, Moving Gate Valve, cut-off Valve, etc.
Post time: Jul-28-2021