Jordan-valve Mark 70 Series – Sliding Gate Control Valve Manual de usuario descargar pdf (Pagina 2)

Valve Seats

DISASSEMBLYA.

The valve seats in all Jordan regulators are lapped to

light band atness. Maintaining such tolerances is of

paramount importance for your assurance of excel-

lent control and tight shut-off. DO NOT use metallic

objects in removing the seats. Care in handling is

imperative.

Close the shutoff valve on each side of the valve, 1.

and remove valve from line.

Note scribed “<” on the side of the valve body (1) 2.

and cap (2). Secure the body outlet at in a vise.

Remove the cap screws and two nuts, and lift the

cap straight up.

Before removing, check the disc (5) for a stamped 3.

arrow. This arrow points to the “<” on the body. Re-

move the disc guide and the disc. Place the valve

disc on the bench with lapped surface facing up.

Protect the lapped surfaced on both sides of the

disc guide.

IMPROPER HANDLING OF SEATS WILL RESULT

IN LEAKAGE OR POOR CONTROL.

It is imperative that the disc pin not be rotated when

disassembling, cleaning, or reassembling, since this

affects the stroke adjustment.

Lightly tap on the body to remove the plate (4). 4.

Invert the body, let valve plate drop out into your

hand, and place it on the bench with lapped sur-

face facing up.

Clean all the parts, body, and cap with solvent. 5.

Place a piece of 4/0 polishing cloth or jewelers

cloth on a smooth, at surface such as a surface

plate, and polish the disc, plate, and disc guide

lapped seating surfaces using a “gure 8” motion.

If the parts are scarred, do not attempt to re-lap

them, but return them to the factory for repair and

replacement. If the seats are not scarred deeply,

they can be repaired at nominal cost.

The vertical sections of the disc guide serve as 6.

guides for the disc while stroking. A 0.005” feeler

gauge should be used to check for clearance be-

tween this surface and the side of the disc. If the

clearance is less, clean the guide surfaces in the

disc guide with a ne le.

B. REASSEMBLY

Place the plate in the body, lapped surface facing 1.

the cap. The index pin hole should be on the same

side as the “<” on the body. Align the disc pin so

that it is centered in the body bore and protrudes

though the center slot in the valve plate (unless you

Start-Up

Be sure that the action of the control valve and of 1.

the controller are such as to give the desired re-

sults.

CONTROLLER ACTION

Increase in

pressure or

temperature must:

And the action of

the valve is:

Then the action

of the controller

must be:

Close Valve Air to Close Direct

Close Valve Air to Open Reverse

Open Valve Air to Close Reverse

Open Valve Air to Open Direct

The control valve has been pre-set by Jordan Valve. 2.

However, ner adjustments may be required to

compensate for pressure drop conditions of the

application. Do not apply more than 45 psi to the

actuator.

With the inlet, outlet, and by-pass shut-off valves 3.

closed, and no pressure in the downstream line,

fully open the outlet shutoff valve. Slowly open the

inlet valve just enough to start ow through the

control valve. Increase ow gradually by slowly

opening the inlet shut-off valve. Do not fully open

the inlet valve until you are sure that the controller

and control valve have control of the system. Usu-

ally, the handwheel on the inlet valve will turn freely

when this point is reached.

To shut off the line uid, close the inlet shut-off 4.

valve rst, then the outlet shut-off valve.

Body and cap bolts should be retightened per 5.

torque procedures after valve reaches operating

temperature.

Maintenance

Caution: Make certain that there is no pressure in the

valve before loosening any ttings or joints. The fol-

lowing steps are recommended:

Close inlet shutoff valve.1.

Allow pressure to bleed off through downstream 2.

piping. Do not attempt to reverse the valve by

bleeding pressure from the upstream side of the

valve.

When the pressure gauges indicate that all pres-3.

sure has been removed from the system, close the

outlet shutoff valve, and the valve may be serviced.

Note: refer to the drawing at the end of this document

for description and proper orientation of parts.

-2-

1 2 3 4 5

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