STARTING IN JULY of 2017 – We will start rebuilding 1st, 2nd, 3rd and 4th stage valves.
Ingersoll Rand/P.C. McKenzie Company Valve Rebuild Program
The compressor stage valves play a very important part to a machines efficiency. The Ingersoll Rand Instruction Manual calls for inspection or service of the stage valves, if necessary, at every 500 hours of operation.
Do you have a tough time scheduling maintenance around rebuilding valves for your Ingersoll Rand CNG compressors?
P.C. McKenzie Company has just announced a program to alleviate the time it takes to rebuild valves. We have certified staff that will inspect and rebuild the valves and replace all of the necessary parts. We can work with any customer that may have specific needs.
P.C. McKenzie stocks all necessary parts for a valve rebuild. Since 1946, we have built a reputation for honestly and quality work. If a valve cannot be rebuilt, we will contact the customer to discuss further action at no additional cost. We welcome any new or returning customer to try this new service. We guarantee you will be satisfied!
4-6 . FIRST STAGE OPERATION .
Gas at a regulated pressure up to 20 PSIG (1.4 kg/cm²) is drawn into the first stage cylinder bore on the suction stroke (down-stroke) of the first and second stage piston. The first and second stages are equipped with concentric ring valves which open only when the proper differential pressure exists across the valve. The inlet valve opens when pressure inside the cylinder is less than the intake pressure. On the compression stroke, the piston compresses the gas to an intermediate level. The discharge valve opens when the pressure within the cylinder becomes greater than the first stage discharge pressure. The inlet valve closes as the discharge valve opens, to prevent the back-flow of gas. The discharged gas is then routed through the finned intercooler tubing to the second stage inlet port. As the gas exits the intercooler outlet manifold, pressure is piped to the first stage relief valve, rated at 200 PSIG (14 kg/cm²), and the first stage pressure gauge.
4-7.SECOND STAGE OPERATION.
The cooled gas enters the second stage compression chamber through the inlet concentric ring valve. On the suction stroke of the first/second stage piston, the gas is compressed to the second stage pressure level (as determined by the pressure switch setting). As before, the discharge valve opens and the inlet valve closes when the gas pressure within the cylinder becomes greater than the second stage discharge pressure. The compressed gas is forced out of the cylinder through the discharge valve and into the second stage intercooler tubing where heat is once again removed from the compressed gas and dissipated into the atmosphere. From the intercooler tubing, the compressed gas is piped into the second stage condensate drain leg. The separator is designed with baffles which circulate the gas in a rapid, spiraling motion in order to achieve maximum separation of condensate from the gas. The compressed gas passes through the separator and is discharged into the third stage inlet tube, while condensate remains trapped in the drain leg. Pressure readings are piped to the second stage relief valve, rated at 800 PSIG (56 kg/cm²), and pressure gauge from the drain leg discharge.
4-8.THIRD STAGE OPERATION.
The third and fourth stages use steeple pistons and dual plate valves. On the suction stroke of the third stage piston, the inlet valve opens on the valve seat allowing gas to be drawn into the cylinder bore where it is compressed to the third stage pressure level. The discharge valve plate opens on the valve seat on the compression stroke of the piston, and gas is expelled through the intercooler tubing into the third stage condensate drain leg. Again, condensate is extracted from the compressed gas as it passes through the spiraled baffles of the separator, and is retained in the drain leg. Pressure readings are piped to the third stage relief valve, rated at 2400 PSIG (169 kg/cm²), and pressure gauge from the drain leg discharge.
4-9.FOURTH STAGE OPERATION.
For the final stage of compression, gas is routed from the third stage drain leg into the fourth stage inlet port. As in the third stage, the inlet valve plate opens on the suction stroke as the gas is forced into the cylinder bore. On the compression stroke, the gas is compressed to its final pressure and forced out through the discharge plate into the intercooler and finally the aftercooler tubing where excess heat is removed before the compressed gas reaches the fourth stage condensate drain leg. Compressed gas is expelled from the drain leg to the discharge connection, with the pressure reading routed to the fourth stage relief valve, set at 5800 PSIG (408 kg/cm²), and pressure gauge.
