0
If you mean by three-valve manifold, then
If you apply excessive pressure to your differential pressure transmitter, you could damage your instrument. This is known as over-ranging the transmitter.
A three-way manifold valve is a device that prevents the instrument from being over-ranged. It also allows the isolation of the transmitter from the process loop (an option which could be used generaly for maintenance or re-calibration or fitting new equipment).
It consists of two blocking valves and one equalizing valve. The blocking valves are for both high pressure and low pressure sides. During normal operation, the equalizing valve is closed and the blocking valves are open. When the transmitter is put into service, care should be taken to ensure that the high pressure is never applied to one side of the Differential Pressure Transmitter.
To put a DPT into service using the Three-way manifold valve is to first close all valves. Then, open the equalizing valve to ensure the same pressure will be applied on both sides of the transmitter. Therefore you will have a zero differential pressure.
Next, the high pressure block valve is opened slowly (to check for leakage from both sides of the transmitter). The equalizing valve is closed and this locks the pressure from both sides of the transmitter. Now open the low pressure block valve to apply the process pressure to the low pressure side and establish the working of the DPT.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoThe 3rd valve is used to equalize the pressure between the two sides of the differential pressure transmitter in order to prevent over-pressurization during calibration or dissassembly. Damage to the diferential pressure transmiitter could occur if one side is still connected to the process whilst the other side is disconnected and exposed to atmospheric pressure.
Add your answer:
Earn +20 pts
Where is PCV valve located on 1992 mustang?
The PCV valve is located in the back of the lower intake manifold. It should have a 3/8" hose going from the PCV valve to a vacuum source on the upper intake manifold.
Where is the PCV valve in your 1990 dodge spirit 3 cylinder v6?
Follow the little hose from the front valve cover to the intake manifold. The part it hooks to on the intake is the pcv valve.
Where is the PCV valve located on a 2001 Nissan Frontier V6?
The PCV valve is located on the back, drivers side of the intake manifold in a short, rubber hose. It is threaded into the intake manifold close to the last "N" in Nissan which is imprinted into the intake manifold. It requires a 3/4" wrench to remove it.
Where is the PCV valve on a zetec s fiesta?
It is located in the intake manifold - there are 3 hoses connected via T-piece. The bottom hose goes into the PCV valve.
How do you locate the EGR valve on 2000 Chevrolet Impala?
It will be on the back of the intake manifold and usually has 3 solenoids mounted together.
Where is the knock sensor on a infinity j30?
The knock Sensor on a J30 ( I have a 1995 ) is at the rear of the engine in the center , under the intake manifold. Find your EGR valve then it is just below that and towards the center of the engine . It is about 3" to 4" under the manifold. YOu can see it with a mirror and a bright light. I am not sure if it can be replaced with out removing the manifold , All I have read says you have to. I am going to try and do it with out all of that work.
Where is the PCV valve on 2007 Honda CR-V?
Standing in front of the auto, the PCV valve is located on your left. The PCV screws into the intake manifold just above the alternator. 1. Remove the two cap screws (10 mm) to remove the intake manifold cover. 2. Remove the PCV hose using needle nose pliers. 3. Use a 17 mm deep well socket to remove the PCV valve from the intake manifold. 4. Install the new PCV valve, PCV hose and intake manifold cover.
Where is the egr valve located on a 2001 frontier truck with a 6 cylinder?
if you look at the drivers exhaust manifold you will see a 3/4" metal tube that screws into the manifold, follow the metal tube up and it srews into the egr valve witch is under the edge of the fuel injection dome on the driverside.
Where can I find the PCV valve on a Mazda 3?
Underneat the intake manifold, two hoses coming off firewall, follow the left one to front of motor. directly left under the plastic intake manifold.
Where is the PCV valve located on a 1992 Pontiac LeMans 4 cylinder?
It should be located right on top of the valve cover, if not then it would be inline with about a 3/8" hose leading over to the intake manifold. There are not that many vacuum lines there, so it shouldn't be that hard to find. The PCV system utilizes a fixed orifice in the intake manifold. There is not a replaceable valve according to Alldata.
Where is the PCV valve located on a 2003 Mazda Tribute?
Unfortunately,, the Mazda engineers located the PCV valve on the 3.0L engines under the intake manifold--essentially right under the throttle body. You can't see it until you pull the upper intake manifold off. I would definitely change out the PCV valve if you are replacing the spark plugs since the manifold has to come off to get to the back 3 spark plugs. A big hint here,, the pcv valve has to be turned 90degrees to the left to get it out of the housing.. a 7/8" 12 point deep socket seems to work. Look at your new pcv valve and you will see what I mean. Once you finally feed in the new pcv valve,, it must be turned 90degrees to the right to get it onto place. A 12" set of needle nose pliers might help also to get the hose off the pcv valve. Gerald
How do you replace PCV valve on a 1998 Kia Sephia?
The PCV valve on any Kia with the 1.8 liter DOHC 4 cylinder(Sephia or Spectra) is located in the aluminum valve cover on top of the engine, on the passenger side and facing the firewall. There is a 3/8" i.d. neoprene hose about 5" long connecting the valve to the intake manifold, with a "squeeze type" hose clamp on each end of the hose. Simply squeeze the clamps with a pair of pliers and move them toward the center of the hose, then work the hose off the fitting on the intake manifold and PCV valve. The valve will probably pull out of the engine valve cover along with the hose. Place the new valve in the valve cover, then reattach the hose and move the clamps back to their original position with pliers. CAUTION: The old hose, if it hasn't been replaced before, will be hard and brittle, and may break. Just get a 6" piece of 3/8" neoprene fuel hose at your parts store, cut it to length, and install it on the PCV valve and manifold fitting with the old clamps. You're done!
