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Bulletin 71.1:Y690A

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

DOWNSTREAM CONTROL PRESSURE

B2626

Figure 3. Types Y690AH and Y690AHM Actuator Casing Drainage Schematic

HORIZONTAL PIPELINE

DOWNSTREAM CONTROL LINE

VENT POINTED DOWN

TYPE Y690AHM

VENT POINTED DOWN

HORIZONTAL PIPELINE

TYPE Y690AH

Installation

Y690A Series regulators may be installed in any orientation

as long as ow through the body matches the direction of

the arrow cast on the body. Normal installation is with the

spring case barrel vertical above or below the diaphragm

case. However, when using a Type Y690A or Y690AM

regulator, for proper operation to achieve the published

capacities, the spring case barrel should be installed pointed

down. For actuator casing drainage of the Types Y690AH

and Y690AHM, regulators should be installed as shown in

Figure 3. When exposed to the weather, the spring case

vent should be pointed downward to allow condensate to

drain. On indoor installations, the vent should be piped

outdoors if used in hazardous gas service. External

dimensions and connections are shown in Figure 4.

Capacity Information

Tables 6 and 7 give the regulating capacities of the

Y690A Series regulators at selected inlet pressures and

outlet pressure settings. Flows are in SCFH (60°F and

14.7 psia) of 0.6 specic gravity natural gas. For gases

of other specic gravities, divide the given capacity by

the square root of the appropriate specic gravity of the

gas required. Then, if capacity is desired in normal cubic

meters per hour at 0°C and 1.01325 bar, multiply SCFH by

0.0268. To determine wide-open ow capacities for relief

sizing, use the following formula:

Q =

520

Sin

3417

Deg

where,

= gas sizing coefcient from Table 2

= C

/ C

, or 35 from Table 2

G = gas specic gravity (air = 1.0)

1abs

= inlet pressure, psia (add 14.7 psi to gauge inlet

pressure to obtain absolute inlet pressure)

Q = ow rate, SCFH

T = absolute temperature in °Rankine of gas at inlet

Table 5. Outlet Pressures and Spring Part Numbers

TYPES

OUTLET CONTROL

PRESSURE RANGES

SPRING PART

NUMBER

SPRING

COLOR

SPRING WIRE

DIAMETER

SPRING FREE

LENGTH

Inches mm Inches mm

Y690A and Y690AM

1 to 2.5-inches w.c. / 2 to 6 mbar

2.5 to 7-inches w.c. / 6 to 17 mbar

1B558527052

(1)(2)

1B653827052

(1)

Orange

Red

0.072

0.085

1.8

2.2

3.78

3.63

96.0

92.2

Y690AH and Y690AHM

5 to 10-inches w.c. / 12 to 25 mbar

7 to 16-inches w.c. / 17 to 40 mbar

15-inches w.c. to 1.2 psig / 37 to 83 mbar

1B653827052

1B653927022

1B537027052

Red

Unpainted

Yellow

0.085

0.105

0.114

2.2

2.7

2.9

3.63

3.75

4.31

92.2

95.2

109

1.2 to 2.5 psig / 83 to 172 mbar

2.5 to 4.5 psig / 0.17 to 0.31 bar

4.5 to 7 psig / 0.31 to 0.48 bar

1B537127022

1B537227022

1B537327052

Light green

Light blue

Black

0.156

0.187

0.218

4.0

4.8

5.5

4.06

3.94

3.98

103

100

101

1. To achieve the published outlet pressure range the spring case must be installed pointing down.

2. Do not use Fluorocarbon (FKM) diaphragm with this spring at diaphragm temperatures lower than 60°F / 16°C.

1 2 3 4 5 6 7 8 9 10 11 12

Bulletin 71.1:Y690A 1

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