Hard seal butterfly valve, also called flap valve, is a regulating valve with simple structure, and can also be used for switching control of low-pressure pipeline medium. Hard seal butterfly valve refers to a kind of valve whose closing part (disc or butterfly plate) is a disc, which rotates around the valve shaft to open and close. It mainly plays the role of cutting off and throttling on the pipeline. The opening and closing part of the hard seal butterfly valve is a disc shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment.
1、 Key points for selection of hard seal butterfly valve products:
1. The main control parameters are specifications and dimensions.
2. The hard sealing butterfly valve is a single plate air valve with simple structure, convenient processing, low cost and simple operation, but poor adjustment accuracy. It is only suitable for the occasion of switching or rough adjustment in ventilation and air conditioning systems.
3. It can be operated manually, electrically or by zipper, and can be fixed at any angle within 90 °.
4. Due to the single shaft and single valve plate, the bearing capacity is limited, and the service life of the valve is short under the conditions of large pressure difference and large flow rate. The valve is divided into closed type and ordinary type, thermal insulation and non thermal insulation.
5. The electric butterfly valve has only two position control, and the electric actuator is the same as the multi blade valve.
2、 Executive standards
Hard Seal Butterfly Valve JB/T7228-94
Manufacturing standard: GB/T 122387-89
Flange standard: JB79-59
Inspection standard: JB/T9092-99
7 structural features of hard sealing butterfly valve:
1. The hard sealing butterfly valve is small in size, light in weight, light in operation and easy to install.
2. The unique design of three-way eccentricity [1] enables friction free transmission between sealing faces, which extends the service life of the valve.
3. The elastic seal is produced by torque.
4. The ingenious wedge design of the hard sealing butterfly valve enables the valve to have an automatic sealing function that is tighter and tighter as it closes. The sealing surfaces are compensatory and have zero leakage.
5. Pneumatic and electric devices can be configured according to user requirements to meet the needs of remote control and program control.
6. The replacement parts of the hard seal butterfly valve can be made of materials suitable for various media and can be lined for anti-corrosion.
7. Diversified continuous structure: clamp, flange, butt welding
Our company specializes in manufacturing D343F-16C, D343H-16C hard seal butterfly valves, which are widely used in pipelines of metallurgical, electric power, petroleum, chemical, air, gas, combustible gas, water supply and drainage and other corrosive media.
Main outline and connection dimensions of D343F-16C and D343H-16C hard seal butterfly valves:
| Nominal diameter |
>Structure length |
>Overall dimension |
Connection size |
| L |
H |
D343H |
D643H |
D943H |
0.6MPa |
1.0MPa |
| mm |
inch |
>Short |
long |
H1 |
A1 |
B1 |
H2 |
A2 |
B2 |
H3 |
A3 |
B3 |
D |
D1 |
Z-d |
D |
D1 |
Z-d |
| fifty |
two |
one hundred and eight |
one hundred and fifty |
one hundred and twelve |
three hundred and fifty |
one hundred and eighty |
two hundred |
six hundred and twenty-five |
two hundred and forty-five |
seventy-two |
five hundred and thirty |
two hundred and fifty |
two hundred and fifty-five |
one hundred and forty |
one hundred and ten |
4-14 |
one hundred and sixty-five |
one hundred and twenty-five |
4-18 |
| sixty-five |
2? |
one hundred and twelve |
one hundred and seventy |
one hundred and fifteen |
three hundred and seventy |
one hundred and eighty |
two hundred |
six hundred and twenty-five |
two hundred and forty-five |
seventy-two |
five hundred and thirty |
two hundred and fifty |
two hundred and fifty-five |
one hundred and sixty |
one hundred and thirty |
4-14 |
one hundred and eighty-five |
one hundred and forty-five |
4-18 |
| eighty |
three |
one hundred and fourteen |
one hundred and eighty |
one hundred and twenty |
three hundred and eighty |
one hundred and eighty |
two hundred |
six hundred and forty-five |
two hundred and forty-five |
seventy-two |
five hundred and sixty-five |
two hundred and fifty |
two hundred and fifty-five |
one hundred and ninety |
one hundred and fifty |
4-18 |
two hundred |
one hundred and sixty |
8-18 |
| one hundred |
four |
one hundred and twenty-seven |
one hundred and ninety |
one hundred and thirty-eight |
four hundred and twenty |
one hundred and eighty |
two hundred |
six hundred and seventy-five |
three hundred and fifty-five |
ninety-two |
six hundred |
two hundred and fifty |
two hundred and fifty-five |
two hundred and ten |
one hundred and seventy |
4-18 |
two hundred and twenty |
one hundred and eighty |
8-18 |
| one hundred and twenty-five |
five |
one hundred and forty |
two hundred |
one hundred and sixty-four |
four hundred and sixty |
one hundred and eighty |
two hundred |
seven hundred and fifteen |
three hundred and fifty-five |
ninety-two |
six hundred and forty |
two hundred and fifty |
two hundred and fifty-five |
two hundred and forty |
