GE Globe Control Valves masoneilan 28000 series Service Manual download pdf (Page 12)

12 | GE Energy

Cryogenic Varipak

28000 EB Series

Simpliﬁed maintenance

This Varipak control valve design meets the requirements of cryogenic process-

es that require thermal insulation. An insulating interface sets up between the

valve body (cold zone) and the body extension located in the higher temperature

area (warm zone). The valve body assembly and its thermal extension are po-

sitioned inside the cold box, and the plug can easily be removed and inspected

without disturbing the valve body. This eliminates the need for any preliminary,

complicated dismounting, and more importantly, prevents any interference

with the cold box.

Body

Manufactured from a material suitable for low temperatures, the valve body

maintains ductility in service. It can be conveniently mounted to suit speciﬁc

piping needs, as long as the angle between the valve axis and vertical does not

exceed 60°.

The bonnet is located away from the cryogenic ﬂuid, which means that the body

gasket is not inside the cold zone. This design prevents any leakage

of the cryogen into the insulated zone.

Body extension

To reduce the inﬂow of head by conduction, thin-walled metal tubes are used

for the body extension and coupling sleeve. In addition, the annular space is

reduced to exclude convection currents.

Plug

The design of the plug allows the working parts to be accurately centered in

relation to the seat and provides a uniform temperature zone for the guiding.

Dimensions – inches (mm)

Rated C

Range

Temperature

Range

Body

Rating

Seat

Leakage

Materials

3.8 to 0.10

(trim No. 0 to 5)

-455°F to +300°F

(-270°C to + 150°C)

ASME Class 150-600

ISO PN 20-100

excepted trim No. 0:

ASME Class 150-300

ISO PN 20-50

Class IV

Body and

Extension

ASTM A 182 Gr. F 316L

Plug/Stem Standard Material

Seat

Trim No. 0: Standard Material

Trim No. 1 to 5: ASTM A 564 Gr. 630

Condition H900 Type 17-4 PH. St. St.

O-ring Seat

Gasket

PTFE

Other Parts Standard Construction: see page 6

Speciﬁc Characteristics

Provide a removal clearance of 5.5 inches (140 mm)

Figure 10: Cryogenic Varipak

2 holes tapped

5/16" – 18 UNC

depth 11 (7/16")

10.24

(260)

4.13

(105)

Handwheel (optional)

20.43

(519)

22.13

(562)

1.30 (33)

4.02

(102)

8.56

(217.5)

2.24

(57)

15.71

(399)

1/4" NPT

Supply Connection

1/4" NPT

Instrument Connection

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GE Globe Control Valves masoneilan 28000 series Service Manual Page 12

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