Basic knowledges about with counter flange and stop device EPDM rubber expansion joint

1. what is counter flange?

Counter flange is another part of the supporting the use of the positive phase flange, avoid one is the line between the two flanges connection difficulties because of the different direction of rotation.

2.what is stop device and the function?

Stop device shall well cooperate with flexible rubber joint for use, when using in general piping connection or pipeline requiring displacement. The stop device can limit the displacement. When flexible rubber joint connects with pump and valve, a stop device can be installed on flexible rubber joint to transmit force. The stop device is an ideal substitute for steel force transmitting joint due to different use conditions.

3.EPDM rubber characteristics:

EPDM rubber (ethylene propylene rubber) has good weather aging resistance, long-term in direct sunlight, cloudy, wet and cold in the bad environment. Resistance to ozone aging properties is very superior, ozone concentration in 8 x 10-100 (PPHM), 2430 h no cracks. Heat resistant performance is good, can be in 120 °C environment medium - and long-term use, use at 150 °C for short periods of time. Ethylene propylene rubber steam performance, heat water resistance is good. Ethylene propylene rubber resistant to low temperature performance is good, can use when - 50 °C.

EPDM rubber is low density, density between 860 ~ 870 kg/m after, so can a lot of oil filling and filling agent. Ethylene propylene rubber has good electrical insulating performance and corrosion resistance performance, volume resistance is in commonly 1015 ~ 1015, Ω cm, within the scope of ethylene propylene rubber water imbibitions.

Ethylene propylene rubber can be resistant to alcohol, acid, alkali, oxidant, detergents, animal and plant oil, ketone, and certain lipids, but not resistant to aromatic solvents and olefin. Ethylene propylene rubber weakness is sulfide is slow, can't and two olefin rubber vulcanization; Self-adhesive and mutual viscosity, flame retardant, air tightness.