Emerson 99 Manuál s instrukcemi stáhnout pdf (Strana 8)

Type 99

Clean out all pipelines before installation and check

to be sure the regulator has not been damaged or

collected foreign material during shipping.

Apply pipe compound to the external pipe threads

only with a threaded body or use suitable line gaskets

and good bolting practices with a anged body. This

regulator may be installed in any position desired as

long as the ow through the body is in the direction

indicated by the arrow on the body. Install a three-valve

bypass around the regulator if continuous operation is

necessary during maintenance or inspection.

Although the standard orientation of the actuator and

pilot to the main valve body is as shown in Figure 1, this

orientation may be changed as far as the inlet tubing

(key 24, Figure 9 or 17) will permit by loosening the

union nut (key 14, Figure 9), rotating the actuator lower

casing (key 29, Figure 9) as desired and tightening

the union nut. To keep the pilot spring case from being

plugged or the spring case from collecting moisture,

corrosive chemicals or other foreign material, the vent

must be pointed down, oriented to the lowest possible

point on the spring case or otherwise protected. Vent

orientation may be changed by rotating the spring case

with respect to the pilot body.

To remotely vent a low-pressure pilot, install the vent

line in place of the pressed-in vent assembly (key 60,

Figure 9). Install obstruction-free tubing or piping into

the 1/4 in. / 6.4 mm vent tapping. Provide protection

on a remote vent by installing a screened vent cap into

the remote end of the vent pipe.

To remotely vent a high-pressure pilot, remove the

threaded-in vent assembly (key 72, Figure 12)

from the high-pressure pilot spring case and install

obstruction-free tubing or piping into the 1/4 in. /

6.4 mm vent tapping. Provide protection on a remote

vent by installing a screened vent cap into the remote

end of the vent pipe.

An upstream pilot supply line is not required because

of the integral pilot supply tubing (key 24, Figure 9

or 17). However, as long as the 1/4 NPT tapping

in the main valve body is plugged, this tubing may

be disconnected from both the main valve and

lter assembly (key 75, Figures 9 and 16) in order

to install a pilot supply line from a desired remote

location into the lter.

If the maximum pilot inlet pressure will be exceeded

by main valve pressure, install a separate pressure

reducing regulator (if not already provided) in the pilot

supply line.

A Type 99 regulator has two 1/2 NPT control line

pressure taps on opposite sides of the lower casing

(key 29, Figure 9). The regulator normally comes from

the factory with the tap closest to the regulator outlet left

unplugged for the downstream control line as shown in

Figure 1 and with opposite tap plugged.

Attach the control line from the unplugged tap 2 to

3 ft / 0.61 to 0.91 meter downstream of the regulator

in a straight run of pipe. If impossible to comply with

this recommendation due to the pipe arrangement, it

may be better to make the control line tap nearer the

regulator outlet rather than downstream of a block

valve. Do not install the tap near any elbow, swage or

nipple which might cause turbulence.

In many instances, it will be necessary to enlarge the

downstream piping to keep ow velocities within good

engineering practices. Expand the piping as close to

the regulator outlet as possible.

WARNING

Adjustment of the pilot control spring to

produce an outlet pressure higher than

the upper limit of the outlet pressure

range for that particular spring can cause

personal injury or equipment damage

due to bursting of pressure-containing

parts. Dangerous accumulation of gases

may also cause bursting if the maximum

actuator emergency casing pressure in

the Specications section is exceeded. If

the desired outlet pressure is not within

the range of the pilot control spring,

install a spring of the proper range

according to the Maintenance section.

Each regulator is factory-set for the pressure setting

specied on the order. If no setting was specied, outlet

pressure was factory-set at the midrange of the pilot

control spring. In all cases, check the control spring

setting to make sure it is correct for the application.

Overpressure Protection

The Type 99 regulator has an outlet pressure

rating lower than its inlet pressure rating. Complete

downstream overpressure protection is required if

the actual inlet pressure can exceed the regulator

outlet pressure rating or the pressure ratings of any

downstream equipment. Although the Type H110

relief valve provides sufcient relief capacity to protect

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