Dimensions/weights (approximate) in mm and kg

Screwed connections

Size

A

B

C

D

E

F

G

Weight

1⁄2"

130 105

75

95 170

70

66

3.4

3⁄4"

175 145 110 105 215

90

80

7.3

Spare parts

The spare parts available are shown in heavy outline. Parts shown

in broken line are not supplied as spares.

1"

205 155 130

11⁄2"

245 180 195

120 250 105

90

150 345 165 105

10.5

19.0

Available spares

Valve and seat assembly *(2 off)

(supplied pre-assembled)

Bucket assembly

Strainer screen

Packet of all gaskets

How to order spares

3, 4, 5, 6, 7, 12, 13, 14*

16*, 19, 20*

8

9, 11

7, 11, 12, 13

F

Withdrawal distance

A1

A

Always order spare parts by using the description given in the

column headed 'Available spares' and state the size, Model No.

and pressure rating of the trap.

Example: 1 off Valve and seat assembly for a Spirax Sarco DN20

SFB8 inverted bucket steam trap for differential pressures up

to 8 bar.

Withdrawal distance

Flanged connections

Size

A1

B

C

D

E

F

G

Weight

DN15

175 105

85

95 180

70

66

4.7

17

12

5.6.14

13

3

DN20

225

DN25

255

DN40

295

145 110 105

155 135 120

180 195 155

215

90

80

9.3

255 105

90

12.8

350 165 105

22.3

4, 19

5

6

Safety information, installation and maintenance

For full details see the Installation and Maintenance Instructions

(IM-P077-02) supplied with the product.

Installation note:

The trap must be installed with the body upright with the strainer cap

at the bottom so that the internal bucket is rising and falling vertically.

Disposal:

This product is recycable. No ecological hazard is anticipated with

the disposal of this product providing due care is taken.

14

16

20

20

8

7

Recommended tightening torques

Item

No.

3

10

16

17

How to order

Example: 1 off Spirax

trap having flanged EN

or

mm

Trap size

N m

25-30

25-40

50-60

80-90

50-60

50-60

70-80

90-110

2.5 - 3

3-4

3-4

5-6

20-25

60-70

40-45

60-70

1⁄2" - DN15

1

5

-

3⁄4" - DN20

1

7

-

1" - DN25

2

2

-

11⁄2" - DN40

3

0

-

1⁄2" - DN15

-

3⁄4" - DN20

-

1" - DN25

-

11⁄2" - DN40

-

1⁄2" - DN15

-

3⁄4" - DN20

-

1" - DN25

-

11⁄2" - DN40

-

1⁄2" - DN15

-

3⁄4" - DN20

-

1" - DN25

-

11⁄2" - DN40

-

M28 x 30

M32 x 36

M42 x 46

M42 x 50

M4x 8

M5x 10

M5x 10

M6x 10

M8x 20

M12 x 25

M10 x 30

M12 x 35

9

11

D

C

G

E

Sarco DN20 SFB4 inverted bucket steam

1092 PN16 connections.

10

B

Steam traps

Inverted bucket

Page 3 of 3

S and SF Series Cast Iron Inverted Bucket Steam Traps

TI-P077-01 ST Issue 5

Page 3 of 3