Steam traps

Balanced pressure

Capacities

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Spare parts

The spare parts available are shown in solid outline. Parts drawn in

broken line are not supplied as spares.

Available spares

Internals set for MST21

How to order spares

3, 4, 5, 6, 7

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Always order spares by using the description given in the column

headed 'Available spares' and state the size, model number and

capsule reference.

Example: 1 off Internals set for a Spirax Sarco 1⁄4" MST21 balanced

pressure thermostatic steam trap having a 'STD' fill capsule for

operation at 10°C below steam saturation temperature.

1

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Differential pressure bar (x 100 = kPa)

Cold water capacity

Hot water capacity

Dimensions / weights (approximate) in mm and kg

Size

A

B

C

D

Weight

1⁄4"

1⁄2"

"

3⁄4"

1"

50.5

8.5

10

61.0

12.5

14

68.0

14.0

14

68.0

14.0

14

75.0

14.0

14

45

0.34

45

0.48

45

0.48

45

0.48

45

0.48

6

4

B

A

3

5

C

D

7

2

Safety information, installation and maintenance

For full details see the Installation and Maintenance Instructions

(IM-P125-07) supplied with the product.

Installation note:

The MST21 is designed for installation with the capsule in a vertical

line with the inlet at the top and the outlet at the bottom. This will

ensure it is self-draining. If fitted in a horizontal line the trap should

be proceded by a short drop-leg.

Caution:

The body/cover gasket contains a thin stainless steel support ring,

which may cause physical injury if it is not handled and disposed of

carefully.

Disposal:

This product is recyclable. No ecological hazard is anticipated with

the disposal of this product, providing due care is taken.

How to order

Example: 1 off Spirax Sarco 1⁄4" MST21 balanced pressure

thermostatic steam trap having a 'STD' fill capsule for operation

approximately at 10°C below steam saturation temperature. The

connections are to be screwed NPT.

Recommended tightening torques

Item

1 and 2

Size

1⁄4"

1⁄2"

"

3⁄4"

1"

or

mm

N m

100 - 110

100 - 110

100 - 110

100 - 110

100 - 110

22

32

32

36

41

TI-P125-08 ST Issue 9

MST21 Stainless Steel Balanced Pressure Thermostatic Steam Trap

5.2.6

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