Wafer type butterfly valve
wafer butterfly valve is wafer type butterfly valve which is installed between two flanges like a waffle, it has very thin body, only need to turn 1/4 turn to achieve the liquid or gas open, close and regulate the flow, flow resistance is very small, full bore, structure is very simple, can be used for the fluid solid or gas.
Judberd is china manufacturer for below wafer type butterfly valve
Wafer type butterfly valve for Neutral water
Material ductile iron body
ductile iron with Ni coated disc
EPDM sealing gasket
Operation Lever
Wafer type butterfly valve for high temperature or corrosive liquids
Material ductile iron body
Stainless steel disc
VITON sealing gasket
Operation worm gear
Wafer type butterfly valve for secondary water supply
Material stainless steel body
Stainless steel disc
EPDM sealing gasket
Operation worm gear
Wafer type butterfly valve for Corrosive liquids
Material ductile iron body
rubber covered ductile iron disc
EPDM sealing gasket
Operation Lever
Judberd wafer butterfly valve feature
Two Circlip and two washer are designed on the stem, one Circlip is stuck on the stem and one Circlip is stuck on the groove of the valve body to prevent the stem from accidentally pulling out
Hexagonal shaft actuation
Precision hexagonal stem and valve disc connection, actuate the valve disc rotation, no screws and pins, eliminate stem leakage, more convenient maintenance and replacement
Inverted v-shape sealing design ensures bi-directional sealing and eliminates leakage from the stem area to the outside.
The top mounting flange of the valve meets ISO5211 standard for easy installation of pneumatic and electric actuation, and the square shaft stem makes the transmission more efficient.
In addition to the above design features, judberd wafer butterfly valves are with brass shaft bushing,Sturdy and wear-resistant,Valve disc with full shaft design, wear-resistant, and we can provide wafer butterfly valves in various materials such as ductile iron, stainless steel, etc. We can also design high temperature resistant viton rubber seals and corrosion resistant fully encapsulated rubber valve disc designs according to the characteristics of the fluid.
For EPDM sealing gasket, we have two different hardness.One is called hard EPDM sealing gasket which is have high hardness EPDM sealing gasket, another is called soft EPDM sealing gasket which is have low hardness EPDM sealing gasket.There specification are as below
Hard (high hardness)EPDM rubber sealing
The hard EPDM rubber seal is more expensive than soft EPDM rubber sealing if the size is bigger than DN 350, but if the size ≤DN350,EPDM hard rubber sealing type butterfly valve have very competitive price than soft EPDM rubber sealing type. The EPDM hard rubber sealing can be used for water or gas and can only be replaced by a machine and can be operated by means of a worm gear, an electric actuator or a pneumatic actuator.
Soft(low hardness) EPDM rubber sealing
if the wafer butterfly valve size is ≥DN400,soft EPDM rubber sealing is much more competitive in price,but it only can be used for water,can’t be used for gas,because gas often evacuates,soft EPDM rubber can’t evacuate,will deformation, can be replaced manually, easy maintenance. Operation can be worm gear, electric actuator, can’t be used with pneumatic actuator, because the pneumatic actuator have very high on-off speed, soft EPDM rubber sealing easy to shift
Wafer type butterfly valve parts
wafer butterfly valve include disc, seat ,stem ,bush ,body, gasket, bolts, circlips , washers, operation instrument(it can be lever, worm gear ,pneumatic or electric actuator)
Wafer type butterfly valve installation
wafer butterfly valve itself has no connection end, it needs to be clamped between two flanges and tight the two flanges by bolts, thus pressing the wafer butterfly valve for sealing.
The installation steps of the wafer type butterfly valve are as follows
1, put the butterfly valve into the middle of the two flanges to be installed
2, according to the number of holes of the wafer butterfly valve, insert the corresponding number of bolts, tight the bolts in the diagonal order, and do not tighten too much.
3, the flange will be pre-installed to the top of the pipe, such as welding flange using spot welding, the threaded flange needs to be pre-tightened
4, remove the butterfly valve
5, the flange will be fixed on the pipe in accordance with the pre-installed position
6, the wafer butterfly valve will be installed to the middle of the two flanges, wafer butterfly valve and the two flanges should have a certain gap
7, according to the diagonal position tighten all the bolts, but not too tight
8, try to open and close the valve to see if the valve can work well, and make the valve disc in a small angle open position
9, according to the diagonal position tighten all the bolts
10, do the valve opening and closing experiment again, make sure the wafer butterfly valve can work well, and the valve disc can move smoothly,ensure the disc does not touch the pipe
