Data Sheet

ManualsBrandsEmerson ManualsRegulators and Relief ValvesEmerson 299H Series Pressure Reducing Regulators

Bulletin 71.2:299H

Table 2. Outlet Pressure Ranges

Table 1. Body Sizes and End Connection Styles

BODY SIZE,

NPS / DN

BODY MATERIAL AND END CONNECTION STYLES

Cast Iron

(For Types 299H and 299HR only)

Ductile Iron

Steel

(For Types 299H and 299HR only)

1-1/4

1-1/2

NPT

- - - -

NPT

- - - -

NPT

2 / 50 NPT, CL125 FF Flanged

(1)

NPT, CL125 FF and CL250 RF Flanged,

PN 10/16 Flanged

NPT, CL150 RF Flanged

1. This ange is available with a face-to-face dimension of 7.5 or 10 inches / 191 or 254 mm.

Type 299HS

Refer to Figure 5. The Type VSX-2 slam-shut device

on the Type 299HS regulator is a fast acting slam-shut

valve which provides overpressure or overpressure

and underpressure protection by completely shutting

off the ow of gas to the downstream system. The

slam-shut module’s actions are independent of the

Type 299HS main regulator and of variations to

the inlet pressure. The Type VSX-2 has internal or

external registration. External registration requires a

downstream sensing line.

The slam-shut disk is held in the open position (reset

position) by a small ball holding the disk stem. If the

pressure below the diaphragm increases (or decreases)

reaching the Type VSX-2 setpoint, the diaphragm will

travel upwards (or downwards) operating a lever which

in turn releases the ball.

Once the ball is released, the spring force on the stem

will push the stem and disk to the closed position against

the seat shutting off all gas ow. The pilot supply pressure

is also shut off when the Type VSX-2 is closed. The

manual reset has an internal bypass to equalize the reset

pressure on either side on the slam-shut disk.

In order for the Underpressure Shutoff (UPSO) of

any slam shut to be triggered, the downstream pipe

pressure must drop below the UPSO setpoint. In the

case of a downstream line break, numerous factors

can prevent the downstream pipe pressure from

decreasing below the slam-shut UPSO setpoint. These

factors include the distance of pipe to the break, the

diameter of the pipe, size of the break and the number

of restrictions, such as valves, elbows and bends,

downstream of the regulator and/or slam-shut device.

Due to these factors additional protections should be

installed to stop ow in the event of a line break.

Overpressure Protection

Like most regulators, the Type 299H has outlet pressure

ratings lower than the inlet pressure ratings. Complete

downstream overpressure protection is needed if the

actual inlet pressure exceeds the outlet pressure rating.

Overpressure protection for internal parts is built

into the main and pilot diaphragms by means of a

small spring on each post. The springs will allow

the diaphragm heads to move farther on the posts

avoiding damage to or bending of the valve trim.

Overpressuring any portion of a regulator or

associated equipment may cause leakage, parts

damage or personal injury due to bursting of pressure-

containing parts or explosion of accumulated gas.

Regulator operation within ratings specied in the

Specications section and on the regulator nameplate

does not preclude the possibility of damage from

external sources or from debris in the pipeline. A

regulator should be inspected for damage periodically

and after any overpressure condition. The pilot vent

is provided with a 1/4 NPT tapped connection in the

spring case.

Monitoring Systems

Monitoring regulators serve as overpressure protection

devices to limit system pressure in the event of open

failure of a working regulator feeding the system.

OUTLET (CONTROL)

PRESSURE RANGE

TYPE PILOT CONTROL SPRING

299H

299HR,

299HS and

299HSR

Part Number Color

Free Length Wire Diameter

Inch w.c. mbar Inch mm Inch mm

3.5 to 6

(1)

5 to 9

(1)

7 to 20

(1)

16 to 40

(1)

9 to 15

(1)

12 to 22

(1)

17 to 50

(1)

40 to 99

(1)

T13707T0012

T13589T0012

1N3112X0012

1B413727222

Black

Yellow

Unpainted

Purple

1.86

2.05

2.18

2.12

47.2

52.1

55.4

53.8

0.055

0.051

0.075

0.092

1.40

1.30

1.90

2.34

1 to 3.25 psig

2.75 to 6 psig

5 to 16 psig

14 to 35 psig

30 to 60 psig

69 mbar to 0.22 bar

0.19 to 0.41 bar

0.34 to 1.1 bar

0.97 to 2.4 bar

2.1 to 4.1 bar

- - - -

T13593T0012

T13671T0012

T13600T0012

19B0432X012

19B0432X022

Light blue

Orange

Red

Zinc

Green

2.12

2.40

2.10

2.15

2.75

53.8

61.0

53.3

54.6

69.8

0.105

0.120

0.142

0.207

0.225

2.67

3.05

3.61

5.26

5.71

1. Use a pilot supply regulator if actual inlet pressure varies more than ±20 psi / ±1.4 bar and the published accuracy is required.