Spirax Sarco HL 17 Manuale utente

IM-P278-01-EN-ISS1 CTLS 1

1. Safety information

2. Installation

3. Start-up

4. Maintenance

5. Spare parts

Printed in GB

1053050/2

HL17

High Limit Cut-out

Installation and Maintenance Instructions

IM-P278-01-EN-ISS1

CTLS

PREVIOUS REFERENCE NO. IM-P073-10

IM-P278-01-EN-ISS1 CTLS

Safe operation of these products can only be guaranteed if they are properly installed, commissioned,

used and maintained by qualified personnel (see Section 1.11) in compliance with the operating

instructions. General installation and safety instructions for pipeline and plant construction, as

well as the proper use of tools and safety equipment must also be complied with.

1.1 Intended use

Referring to the Installation and Maintenance Instructions, name-plate and Technical Information

Sheet, check that the product is suitable for the intended use/application. The products listed below

comply with the requirements of the Pressure Equipment Directive (PED) and carry the mark

when so required. The products fall within the following Pressure Equipment Directive categories:

Product Group 2

Gases

HL17, sizes DN15 - 40 SEP

HL17, sizes DN50 and 80 1

i) The products have been specifically designed for use on steam which is in Group 2 of the above

mentioned Pressure Equipment Directive. The products’ use on other fluids may be possible

but, if this is contemplated, Spirax Sarco should be contacted to confirm the suitability of the

product for the application being considered.

ii) Check material suitability, pressure and temperature and their maximum and minimum values.

If the maximum operating limits of the product are lower than those of the system in which it

is being fitted, or if malfunction of the product could result in a dangerous overpressure or

overtemperature occurrence, ensure a safety device is included in the system to prevent such

over-limit situations.

iii) Determine the correct installation situation and direction of fluid flow.

iv) Spirax Sarco products are not intended to withstand external stresses that may be induced

by any system to which they are fitted. It is the responsibility of the installer to consider these

stresses and take adequate precautions to minimise them.

v) Remove protection covers from all connections before installation.

1.2 Access

Ensure safe access and if necessary a safe working platform (suitably guarded) before attempting

to work on the product. Arrange suitable lifting gear if required.

1.3 Lighting

Ensure adequate lighting, particularly where detailed or intricate work is required.

1.4 Hazardous liquids or gases in the pipeline

Consider what is in the pipeline or what may have been in the pipeline at some previous time.

Consider: flammable materials, substances hazardous to health, extremes of temperature.

1. Safety information

IM-P278-01-EN-ISS1 CTLS 3

1.5 Hazardous environment around the product

Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases, extremes of

temperature, hot surfaces, fire hazard (e.g. during welding), excessive noise, moving machinery.

1.6 The system

Consider the effect on the complete system of the work proposed. Will any proposed action (e.g.

closing isolation valves, electrical isolation) put any other part of the system or any personnel at risk?

Dangers might include isolation of vents or protective devices or the rendering ineffective of controls

or alarms. Ensure isolation valves are turned on and off in a gradual way to avoid system shocks.

1.7 Pressure systems

Ensure that any pressure is isolated and safely vented to atmospheric pressure. Consider double

isolation (double block and bleed) and the locking or labelling of closed valves. Do not assume

that the system has depressurised even when the pressure gauge indicates zero.

1.8 Temperature

Allow time for temperature to normalise after isolation to avoid danger of burns.

1.9 Tools and consumables

Before starting work ensure that you have suitable tools and/or consumables available. Use only

genuine Spirax Sarco replacement parts.

1.10 Protective clothing

Consider whether you and/or others in the vicinity require any protective clothing to protect against

the hazards of, for example, chemicals, high/low temperature, radiation, noise, falling objects, and

dangers to eyes and face.

1.11 Permits to work

All work must be carried out or be supervised by a suitably competent person.

Installation and operating personnel should be trained in the correct use of the product according

to the Installation and Maintenance Instructions.

Where a formal 'permit to work' system is in force it must be complied with. Where there is no such

system, it is recommended that a responsible person should know what work is going on and, where

necessary, arrange to have an assistant whose primary responsibility is safety.

Post 'warning notices' if necessary.

1.12 Handling

Manual handling of large and/or heavy products may present a risk of injury. Lifting, pushing,

pulling, carrying or supporting a load by bodily force can cause injury particularly to the back.

You are advised to assess the risks taking into account the task, the individual, the load and the

working environment and use the appropriate handling method depending on the circumstances

of the work being done.

1.13 Residual hazards

In normal use the external surface of the product may be very hot. If used at the maximum

permitted operating conditions the surface temperature of some products may reach temperatures

of 300 °C (572 °F).

Many products are not self-draining. Take due care when dismantling or removing the product from

an installation (refer to 'Maintenance instructions').

IM-P278-01-EN-ISS1 CTLS

1.14 Freezing

Provision must be made to protect products which are not self-draining against frost damage in

environments where they may be exposed to temperatures below freezing point.

1.15 Disposal

Unless otherwise stated in the Installation and Maintenance Instructions, this product is recyclable

and no ecological hazard is anticipated with its disposal providing due care is taken.

1.16 Returning products

Customers and stockists are reminded that under EC Health, Safety and Environment Law, when

returning products to Spirax Sarco they must provide information on any hazards and the precautions

to be taken due to contamination residues or mechanical damage which may present a health,

safety or environmental risk. This information must be provided in writing including Health and

Safety data sheets relating to any substances identified as hazardous or potentially hazardous.

IM-P278-01-EN-ISS1 CTLS 5

2.1 General information

The purpose of the solenoid valve is to shut-off the main valve. It can be controlled by any device capable

of interrupting the supply of current to the solenoid coil, such as a thermostat. The solenoid is arranged to

open the valve when the coil is energised to that whatever switching device is used it must be arranged to

break the current to close the main valve. In this way, the unit will always 'fail-safe', i.e. will close the main

valve in the event of a failure in electrical supply.

2.2 Electrical supply

It is important that the solenoid is connected to the correct voltage. The standard unit is suitable for 110

Vac or 230/250 Vac 50 Hz supply, but units for other ac voltages may be supplied to special order, therefore

always check on the supply details which are stamped on the solenoid valve name-plate before attempting

to connect up.

Electrical connection is by cable plug to DIN 43650. Remember that the valve is on a steam supply line and

in use will get hot. All wiring, connectors, etc. in close proximity to the valve should therefore be of heat

resisting type.

Earth

The solenoid valve should be adequately earthed.

2.3 Pipeline sizing

The piping on both sides of the valve must be sized so that velocities do not exceed 30 m/s (98 ft/s). This

means that a properly sized valve will often be smaller than the connecting pipework.

2.4 Pipeline stresses

Line stresses such as could be caused by expansion or inadequate support should not be imposed on the

valve body.

2.5 Isolating valves

These should preferably be of the fullway type.

2.6 Preventing dirt

The valve should be protected by a pipeline strainer with 100 mesh screen. The strainer should be fitted on

its side to prevent the accumulation of water.

2.7 Testing

The HL17 is an emergency safety device and as such, it is essential that it be frequently tested for satisfactory

operation. To test that the valve will close, either temporarily raise the system temperature or disconnect

the power supply to the solenoid valve. After the test has been successfully carried out, ensure that the

system temperature has returned to normal and that the power supply to the solenoid has been reconnected.

2. Installation

IM-P278-01-EN-ISS1 CTLS

In most new installations dirt collects in the steam line during construction. It is always advisable to blow

this out on initial start-up.

Remove the cap on the strainer before the steam trap, crack open the steam supply blowdown to clear dirt,

shut-off and replace cap.

It is essential that the screen in the main line strainer is not removed during this operation.

If a blowdown cock is fitted to the strainer cap it can be opened to blow out the dirt without removing the cap.

Important

Direct injection systems

This product contains a rust inhibitor to protect it against corrosion during storage. To

avoid any possible contamination of your product, after first blowing down the approach

pipework, we recommend that the valve is blown through thoroughly in order to remove

any trace of the inhibitor.

3. Start-up

IM-P278-01-EN-ISS1 CTLS 7

4.1 Routine maintenance

It is recommended that the valve is occasionally given a complete overhaul and ideally this should be carried

out with the valve removed from the line.

The parts that may require replacing or refurbishing are listed below:

-Main valve seat and valve head.

-Main valve screen.

-Main diaphragms.

Important - It is required to periodically check the external pipework and fittings and remove any debris

which might affect the performance of the valve.

Safety warning:

The body gasket contains a thin stainless steel support ring which may cause physical injury if

not handled and disposed of carefully.

Main valve screen

Solenoid valve shown out

of position

Main valve seat and

valve head

Main diaphragms

4. Maintenance

IM-P278-01-EN-ISS1 CTLS

4.2 To clean the strainer and replace the gasket

Isolate the valve and zero the pressure.

1. Unscrew the unions and release pipework.

2. Unscrew the nuts.

3. Remove the top housing complete with the solenoid valve.

4. Remove the screen and clean (or replace if necessary).

5. Ensure the main valve return spring is still in position.

6. Fit the new gasket.

7. Replace the screen.

Assemble the top housing and tighten the nuts

to the torques shown in Table 1.

Refit the pipework and retighten the unions to

ensure a steam tight seal.

Refit the solenoid valve.

Bring the valve back into commission.

Table 1 Recommended tightening torques

Size of valve Nut size Tightening torques

½",¾" and 1"

DN15,DN20,DN25 and DN32 M10 40 N m (30 lbf ft)

DN40 and DN50 M12 45 N m (33 lbf ft)

DN80 M12 80 N m (59 lbf ft)

IM-P278-01-EN-ISS1 CTLS 9

4.3 To renew or clean the main diaphragms

Isolate the valve and zero the pressure.

8. Undo the long union nut and pull away.

9. Undo the M12 nuts and bolts.

10. Drop away the lower diaphragm chamber, the

two diaphragms, diaphragm plate and pushrod

assembly.

11. Thoroughly clean the lower diaphragm chamber

making sure the contact faces are clean.

12. Replace the diaphragm plate and pushrod

assembly and loosely fit the lower diaphragm

chamber on two bolts either side of the union

connection to locate spigot in recess.

13. Bring the two new diaphragms together (where

precoated sealant is applied this should

face outwards) and slide into position. If

diaphragms are not renewed, but cleaned only

care must be taken to replace diaphragms in

the original order.

14. Push the lower diaphragm chamber home to

locate in the recess and refit M12 nuts and

bolts. Progressively and evenly tighten to a

torque of 75 N m.

15. Retighten the long union nut to ensure a steam

tight seal. Bring the valve back into commission.

1514

IM-P278-01-EN-ISS1 CTLS

4.4 To service or renew the main valve and seat

Isolate the valve and zero the pressure.

16. Unscrew the unions and release pipework.

17. Unscrew the nuts.

18. Remove the top housing.

19. Remove the screen and clean.

20. Remove the main valve spring and the main

valve head.

21. Remove the main valve seat. Examine the faces

of the main valve head and seat. If they are only

slightly worn both the main valve head and main

seat may be lapped on a flat plate using a fine

grinding paste. If either is badly worn or unfit

for further use they will need to be replaced.

22. Refit the valve seat and tighten to the

recommended torque shown in Table 2.

Where a new part has been fitted it will be

necessary to reset the main valve pushrod

to give the correct valve lift. To do this it is

necessary to expose the main diaphragm plate

and pushrod assembly.

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