Pneumatic stainless steel butterfly valve-Fornitore globale

No. 118, Building 4, Yulin Electromechanical City, No. 58 Xingyuan East Road, Zhangdian District, Zibo City, Shandong Province

Pneumatic stainless steel butterfly valve

Introduction to Pneumatic Hard Seal Butterfly Valve:

Pneumatic hard seal butterfly valve belongs to long-life and high-quality butterfly valves, designed using the three-dimensional eccentric principle，It is mainly composed of flange or clamp type hard sealed butterfly valves connected to pneumatic actuators,The valve seat and disc sealing surface are made of metal materials or stainless steel with different hardness, which have the advantages of high temperature resistance, corrosion resistance, wear resistance, etc. The pneumatic hard seal butterfly valve adopts a multi-level structure that is compatible with both hard and soft seals, ensuring excellent sealing performance in both low and high temperature conditions. The disc and seat of the valve have almost no friction during opening and closing, greatly improving the service life of the butterfly valve. Pneumatic hard sealed butterfly valves are widely used in pipelines for power, oil, steam, air, sewage and other media, and are the best device for switch control or flow regulation.

Performance characteristics of pneumatic hard seal butterfly valve:

1. Adopting the three eccentric principle structure, the valve seat and disc plate have almost no friction during opening and closing, which improves the service life.

2. Unique structure, flexible operation, labor-saving, convenient, not affected by high or low medium pressure, reliable sealing performance.
3. It can be divided into pneumatic clamp type hard seal butterfly valves and pneumatic flange hard seal butterfly valves, which meet different connection methods and are easy to install in pipelines.

3. Sealing is composed of stacked soft and hard metal sheets, which have the dual advantages of metal sealing and elastic sealing. It has excellent sealing characteristics at both low and high temperatures.

5. The butterfly valve is equipped with a sealing adjustment device. If the sealing performance decreases after long-term use, the disc sealing ring can be adjusted to move closer to the valve seat to restore the original sealing performance, greatly improving the service life.

Technical parameters of pneumatic hard seal butterfly valve:

Nominal Diameter	DN50～DN1200(mm)
pressure rating	PN1.0、1.6、2.5、4.0MPa
Connection method	Clamp type and flange connection
sealing form	Metal hard seal
Drive mode	Air source drive, compressed air 5-7 bar (with handwheel available)
Operating range	0～90°
body material	Carbon steel, stainless steel 304, stainless steel 316
workplace	Water, steam, oil, acid corrosion, etc. (applicable to high-pressure and high-temperature environments)
temperature range	Carbon steel: -29 ℃~450 ℃ Stainless steel:- 40℃～450℃
control mode	Switch mode (switch two position control,Air open, air closed type）Intelligent regulation type (4-20mA analog signal)Spring reset

Pneumatic hard seal butterfly valve actuator:

air supply pressure	0.4～0.7MPa
air connection	G1/4'、G1/8'、G3/8'、G1/2'
ambient temperature	-30～+70℃
Action form	Single acting actuator: gas closed type (B) - valve position open when gas is lost (FO); Pneumatic opening (K) - valve position closed when gas is lost (FC) Double acting actuator: gas closed type (B) - valve position maintenance during gas loss (FL); Pneumatic opening (K) - valve position maintenance during gas loss (FL)
Can be equipped with accessories	Positioner, solenoid valve, air filter pressure reducer, holding valve, travel switch, valve position transmitter, handwheel mechanism, etc

Pneumatic hard seal butterfly valve andPneumatic soft seal butterfly valveThe difference:

1. Soft seals are used for low pressure to atmospheric pressure, while hard seals can be used for medium to high pressure conditions.
2. Soft seals are used in low-temperature and room temperature environments, while hard seals can be used in low-temperature, room temperature, high-temperature and other environments.

3. Soft sealed butterfly valves are mostly of medium linear structure, while hard sealed butterfly valves are generally of single eccentric, double eccentric, and triple eccentric structures.

4. Soft sealed butterfly valves have better sealing performance than three eccentric hard sealed butterfly valves, but three eccentric butterfly valves can maintain good sealing in high-pressure and high-temperature environments.

Advantages and disadvantages of pneumatic hard seal butterfly valves and pneumatic soft seal butterfly valves:

Hard sealed butterfly valves have a long service life, but their sealing performance is relatively poor compared to soft seals.

The advantage of soft sealed butterfly valves is good sealing performance, but the disadvantages are easy aging, wear, and short service life.

Soft sealed butterfly valves are mostly suitable for opening, closing, and regulating pipelines containing corrosive substances at room temperature, while hard sealed butterfly valves are mostly used for heating, gas supply, gas, oil, acid and alkali environments.