Steam traps

Inverted bucket

Dimensions / weights (approximate) in mm and kg

Size

DN15

1⁄2"

DN20

3⁄4"

DN25

1"

Weight

2.6

3.2

8.8

A A1 B

C

F G

H

J

120 210 100

100 73.5 89

65 M28

120 210 100

140

94.5 107

65

M28

180 230 160

160 145.0 120

85 M32

A1

A

B

C Withdrawal

distance

J

Withdrawal distance

F

G

H

Safety information, installation and maintenance

Pressure

Before attempting any maintenance of the steam trap, consider what is or may have been in the pipeline. Ensure that any pressure

is isolated and safely vented to atmospheric pressure before attempting to maintain the steam trap. This is easily achieved by fitting

Spirax Sarco depressurisation valves type DV (see separate literature for details). Do not assume that the system is depressurised

even when a pressure gauge indicates zero.

Temperature

Allow time for temperature to normalise after isolation to avoid the danger of burns and consider whether protective clothing (including

safety glasses) is required.

Warning

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.

Installation

The trap must be installed with the body upright so that the bucket is rising and falling vertically. The inlet and outlet connections should

be in a horizontal plane, with the trap installed below the drain point so that a water seal can be maintained around the open end of the

bucket.

Suitable isolation valves must be installed to allow for safe maintenance and trap replacement. Remove all protective caps prior to

installation. Open isolation valves slowly until normal operating conditions are achieved. Check for leaks and correct operation.

Maintenance

Maintenance can be completed with the trap in the pipeline, once the safety procedures have been observed. It is recommended that new

gaskets and spares are used whenever maintenance is undertaken. Ensure that the correct tools and necessary protective equipment are

used at all times. When maintenance is complete open isolation valves slowly and check for leaks.

How to fit the valve and seat assembly

Isolate the trap, remove the cover by undoing the cover nuts.

Unhook the bucket from the valve lever. Remove the valve seat.

Remove the valve guide plate by undoing the two screws. Screw in a new valve seat, using a little jointing paste on the threads and making

sure the joint faces are clean. Fix a new valve guide plate in position by using the new screws which are supplied, hook the new valve

lever over the pins on the valve guide plate and centralise the valve to the orifice and tighten the screws.

Note: Due to adoption of metric threads the spares for the HM series, other than buckets, are not interchangeable with the spares for the

previous H series.

How to clean or replace the strainer screen

Undo the strainer cap and remove the screen. Clean or replace as required and reassemble the strainer cap into the body, ensuring the

screen is located centrally and a new gasket is used. Using a little anti-seize compound on the threads tighten to the recommended torque.

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 3⁄4" HM10/7 inverted bucket steam trap with screwed BSP connections.

TI-S03-02 ST Issue 6

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HM Series Cast Iron Inverted Bucket Steam Traps

5.6.4