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Lug butterfly valves

Lug style valves

It is a valve that uses a disc-type opening and closing member to reciprocate about 90° to open, close and adjust the fluid channel. Butterfly valve not only has simple structure, small volume, light weight, low material consumption, small installation size, but also small driving torque, easy and fast operation, and also has good flow regulation function and closing sealing characteristics. One of the fastest-growing valve varieties.

Butterfly valves are widely used, and their varieties and quantities are still expanding, and they are developing towards high temperature, high pressure, large diameter, high sealing performance, long life, excellent adjustment characteristics and multi-function of one valve. Its reliability and other The performance indicators have reached a high level, and have partially replaced globe valves, gate valves and ball valves

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Uses and Features

The soft sealing butterfly valve is suitable for water supply and drainage, gas pipelines such as food, medicine, chemical industry, petroleum, electric power, metallurgy, urban construction, light textile, paper making, etc. to adjust the flow and intercept the medium. Its main features are:

  1. The design is novel and reasonable. , light weight, quick opening and closing.
  2. The operating torque is small, the operation is convenient, and it is labor-saving and ingenious .
  3. It can be installed in any position and easy to maintain.
  4. The sealing parts can be replaced, the sealing performance is reliable, and the two-way sealing is zero leakage.
  5. The sealing material has the characteristics of aging resistance, corrosion resistance and long service life.
  6. Simple structure, good general interchangeability and low price.
  7. The valve stem seal is not easily deformed to avoid the usual valve stem leakage. The overall support is good, stable and firm.
  8. The amount of rubber on the valve seat is small, the potential impact of expansion is small, and it is easy to control the torque value within an appropriate range. The two- section valve stem is connected without pins . The structure is simple and compact, and the maintenance and disassembly are extremely convenient.
  9. The butterfly plate has automatic energy matching, which realizes the small interference fit between the butterfly plate and the valve seat. The phenolic backrest has the characteristics of non-shedding, tensile resistance, leakage prevention, and easy replacement. Since the sealing surface of the valve seat is integrated with the backrest, the deformation of the valve seat is reduced.

Model instructions

valve type transfer method Connection Type structure type sealing material Nominal pressure Body Material
D: butterfly valve This column is not written when it is manual 7L: Wafer Type Single Clip Type 1: center line X: Rubber -10:PN1.0MPa Z: Grey cast iron
Q: Ductile iron

Adopt standard

design standards GB/T12238-2008, ISO 10631-1994 or BS EN593-1998, BS5155, MSS SP-67
Flange connection GB/T17241.6-2008, JIS B2212-B2214-1999, JIS B2220-2004, JIS B2210-1984, ANSI B 16.5-2009, ANSI B 16.47-2006, ISO 7005-2 or BS EN 1092-2002 (PN6, PN10, PN16, Class 125, Class150, 5K, 10K, 16K)
Structure length GB/T12221-2005, IS0 5752-1988SBSEN558-1
pressure test GB/T13927-2008, JB/T9092-1999, ISO 5028-1993 or BS 5755-1-1986
top flange Comply with IS05211 and other standards

Sealing Principle

Sealing principle is to ensure that the sealing surface of the valve plate has a suitable surface roughness value during processing, and the synthetic rubber valve seat forms a suitable surface roughness value of the sealing surface during molding. When the valve is closed, through the rotation of the valve plate, the outer sealing surface of the valve plate squeezes the synthetic rubber valve seat, so that the synthetic rubber valve seat is elastically deformed to form an elastic force as the sealing pressure to ensure the sealing of the valve.

Main external dimensions

Lug style valves

 

Nominal diameter
DN(mm)		 Outer diameter D Center distance D1 Number of bolt holes
and hole diameter Z x Mφ		 Structure length L total height H Base height H1 Handle length A chainring width B
40 150 110 4xM16 43 220 68 240 98
50 165 125 4xM16 43 235 68 240 98
65 185 145 4xM16 46 250 75 240 98
80 200 160 8xM16 46 275 85 240 98
one hundred 220 180 8xM16 52 315 105 270 108
125 250 210 8xM16 56 340 120 320 108
150 285 240 8xM20 56 375 135 320 108
200 340 295 8xM20 60 470 165 365 155

 

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