Manual Hard Sealed Butterfly Valve D73H/D43H/D71H/D41H

The D73H/D43H/D71H/D41H manual hard seal butterfly valve is installed in systems such as petroleum, chemical, food, medicine, light textile, paper making, water and electricity, ships, water supply and drainage, smelting, etc. It is used for regulating and intercepting all corrosive and non corrosive gases, liquids, semi fluids, and solid powders in pipelines and containers, and can be installed in any position.

Product features:

1. The selection of operating mechanism for butterfly valves is flexible.
2. The butterfly valve has a beautiful appearance and good corrosion resistance.
3. Reasonable design, compact structure, simple installation and disassembly and easy maintenance.
4. The flow characteristics of the disc sealing surface are linear, with a small flow resistance coefficient, resulting in a small valve flow resistance.
5. The sealing form adopts a triple eccentric design and the tighter the seal, the better the sealing performance.

Product execution standards:
Manufacturing standard: GB/T 122387-89
Flange standards: GB9113-2000, GB17241.6-1998
Structural length standard: GB12221-89
Inspection standard: GB/T 13927-92
Leakage rate: GB/T13927-92

Main component materials:
Valve body: CF8, CF8M, WCB
Disc: body material+metal graphite
Valve seat: Body welding 507Mo, welding STL
Valve stem: 2Cr13, 304

Product external structural connection size:

Installation precautions:

1. Before installation, the specifications, pressure, temperature, and corrosion resistance of the butterfly valve should be checked to ensure that they meet the requirements for use. Each component should be checked for damage or looseness.
2. This butterfly valve can be installed on pipelines at any angle and should be closed for installation; When welding pipeline flanges, the valve sealing port should be blocked with a plate to prevent particles and debris from damaging the sealing surface. After welding, remove the valve, clean the valve sealing surface and pipeline cavity, and then install and fix the valve.
3. Please pay attention to the pressure direction when installing when the valve is closed.
4. Before installation, the sealing surfaces (sealing surfaces at both ends, butterfly plate sealing surfaces, and valve seat sealing surfaces) should be thoroughly wiped clean to remove dust and dirt.
5. Before installation, the butterfly valve should be air tested, with flexible opening and closing, and the opening and closing positions should match the indicated positions of the pointer.
6. Manually operate clockwise to close and counterclockwise to open. Do not apply force to open or close the valve after the pointer indicates it is in place.
7. When conducting pressure tests on valves, it is not allowed to use a single flange for installation and pressure testing. Double flange installation and pressure testing must be used. The test pressure should comply with the provisions of GB/T13927-92 standard.
8. When tightening bolts, they should be tightened symmetrically and alternately, and individual tightening in sequence is not allowed.
9. The limit screw has been adjusted before leaving the factory and should not be easily adjusted. If the drive device is configured as electric or pneumatic, please refer to the accompanying drive device manual.
10. The opening and closing stroke of the control mechanism has been adjusted when the electric butterfly valve leaves the factory. To prevent incorrect direction when the power is turned on, the user should manually turn it on to the half open position before the first power connection, then press the jog switch, and check that the direction of the indicator panel is consistent with the direction of the valve opening.
11. If the valve is found to have abnormal opening and closing, the cause should be identified for repair and elimination to prevent damage to the valve caused by using force to open and close the valve.

Shanghai Zhong hang Valve Factory is a professional manufacturer of butterfly valves in Shanghai, with high-performance butterfly valves as its flagship product. Other types of butterfly valve products include hard sealed butterfly valves, soft sealed butterfly valves, triple eccentric butterfly valves, double eccentric butterfly valves, single eccentric butterfly valves, center line butterfly valves, fluorine lined butterfly valves, ventilation butterfly valves, gas specific butterfly valves, high-pressure butterfly valves, high-temperature butterfly valves, and three-way butterfly valves. Our engineers have decades of professional experience, and we welcome you to call us for business negotiations!