Pneumatic valve on the tips

. Note the amount of fat often ignore.
note grease gun after refueling, operators choose pneumatic valves and greasing connection, on the operations.
there are two kinds of circumstances: on the one hand, on the quantity is little greasing, sealing surface due to the lack of lubricant and speed up the wear and tear.
greasing too much on the other hand, cause waste. Should use pneumatic valve size and class calculate the sealing capacity, then the reasonable injection amount of grease.
. Often ignore the pressure problem.
in the greasing operation, on the pressure changes regularly with peak valley.
pressure is too low, seal leakage or failure, the pressure is too high, greasing the jams, seal inside lipid hardening or seal and pneumatic ball valve, pneumatic valve plate lock.
usually fat injection pressure too low, injecting grease into the pneumatic valve at the bottom of the cavity, more commonly occur in small brake pneumatic valve.
and fat injection pressure is too high, on the one hand, to check on the mouth, so fat pore blocking determine to change the situation;
is lipid hardening on the other hand, to use cleaning fluids, repeated failure sealing grease of softening, and inject new replacement grease.
in addition, the sealing type and sealing material, also influence on the pressure, different seal forms have different fat injection pressure, usually hard seal fat injection pressure is higher than the soft seal.
. Often ignore the fat injection effect problem.
note in the fat operation pressure, fat injection rate, the switch is normal. But in order to ensure the pneumatic valve grease injection effect, and sometimes need to open or close the pneumatic valve, check the lubrication effect, confirm the pneumatic valve pneumatic valve ball or disc surface lubrication even.
greasing, pay attention to the aerodynamic body bleed and plug pressure problem. Pneumatic valve down after test, seal chamber pneumatic valve cavity gas and moisture by environmental temperature and pressure, on the drainage pressure, before for greasing work smoothly.
note after fat, air and water are fully replace seal cavity. To timely drain off pneumatic valve cavity pressure, but also to ensure the safety of the use of pneumatic valve. On the end, be sure to tighten the drainage and blowdown plug, in case of an accident.
pneumatic valve on the matters that should pay attention to:
. Greasing the attention to the problem of pneumatic valve in switch.
pneumatic ball valve maintenance generally is in open state, when special circumstances to choose shut down maintenance.
other pneumatic valves are not all in open position. Brake pneumatic valve must be closed during maintenance, to ensure the sealing ring is full of grease seal grooves, if open, sealing grease directly off the inflow, or pneumatic valve cavity, wasteful.
. Note the problems should pay attention to the grease evenly during grease.
normal greasing, distance on the mouth of the lipid Kong Xian recently fat, and then to low, the last is high, successive fat. If not according to the law or not fat, exist jams, QingTong processing in a timely manner.
. Note fat pay attention to the pneumatic valve size and seal flush problem.
the pneumatic ball valve, for example, if there is a interference, can be adjusted to the open a limiter, after confirm size flat lock. Adjust the limit not only the pursuit of open or GuanYiFang position, want to consider as a whole. If a flush and close does not reach the designated position, will cause the pneumatic valve is lax. By the same token, the adjustment locked in place, also want to consider to open a corresponding adjustment. Ensure that the pneumatic quarter-turn valves.
. Note fat also should pay attention to on the pneumatic valve stem position.
pneumatic valve shaft parts with sliding sleeve or packing, also need to keep the lubrication state, to reduce the operation of the friction resistance, as does not ensure lubrication, enlarging the worn parts, electric operation torque, when the manual switch.