Jordan-valve Mark DBAQ Series Angle Style Control Valve Uživatelský manuál stáhnout pdf (Strana 3)

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Stem Diameter Valve Class

Rating

Lbf•Ft N•M

Inch mm Min Max Min Max

1/2 12.7 1500 11 16 15 22

2500 13 18 18 24

3/4 19.1 1500 25 37 34 50

2500 30 45 41 61

1 25.4 1500 38 57 52 77

2500 45 67 61 91

1-1/4 31.8 1500 50 75 68 102

2500 60 90 81 122

Table 1: Recommended Torque for Packing Flange Nuts

Adding Packing Rings

When using packing with lantern ring it may be possible

to add packing rings above the lantern ring as a

temporary measure without removing the actuator from

the valve body.

1. Isolate the control valve from the line pressure

and release the pressure from the valve body.

2. Remove the packing ﬂange nuts (key 18, Figure

7) and lift the packing ﬂange (key 16), upper

wiper (key 20) and packing follower (key

21, Figure 7) away from the valve body.

3. Take care when removing out the old packing

rings to avoid scratching the valve plug

stem or packing wall. Clean all

metal parts to remove debris that

would prevent the packing from sealing properly.

4. Should split ring packing be added, spread the

rings over the stem and slide the rings into

the packing box. Alternate the position

of the splits to avoid creating a leak

path. If solid ring packing is being

added, remove the stem connector and

slip the rings over the end of the valve stem.

5. Re-assemble the packing follower, upper wiper,

packing ﬂange, and packing ﬂange nuts. (keys

21, 20, 16, and 18).

6. Reconnect the body actuator stem connection

according to the appropriate manual. Torque

accordingly, reference Table 3.

Replacing Packing

Prior to beginning any maintenance, it is important to

isolate the valve from the line pressure, and to release

all pressure from the valve body. Disconnect all operat-

ing lines to the actuator, including air pressure, electri-

cal power or control signal lines. The process pressure

should be released both upstream and downstream of

the valve. Drain the process ﬂuid from both sides of the

valve.

Employ lockout procedures to ensure the safety of per-

sonnel and equipment during the valve service.

NOTE: Extreme caution must be used during the dis-

assembly. Nicks and scratches will affect the ability

to seal the valve in the future.

1. Remove the capscrews in the stem connector

and separate the two halves. Exhaust all actua-

tor pressure if any was applied, and discon-

nect the actuator supply and leak off piping.

2. Remove the yoke locknut, and remove the

actuator from the bonnet (key 2).

3. Loosen the packing ﬂange nuts (key 18), and

remove any travel indicator parts and stem

locknuts from the valve stem threads

Mark DBaQ SerieS angle Style Control ValVeS

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Jordan-valve Mark DBAQ Series Angle Style Control Valve Uživatelský manuál Strana 3

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