Spirax Sarco 25E Manuale utente

IM-P717-02-US Issue 1 1

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

Printed in US

Type 25E and 26E

Electric Pilot Operated Valve

(for Steam or Air Service)

Installation and Maintenance Instructions

IM-P717-02-US

Issue 1

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.

i) The products have been specifically designed for use on steam, air or water/condensate.

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 and protective film from all name-plates,

where appropriate, before installation on steam or other high temperature applications.

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. Safety information

IM-P717-02-US Issue 1

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

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.

1.5 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.

IM-P717-02-US Issue 1 3

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

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 in excess 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').

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.

1.17 Working safely with cast iron products on steam

Cast iron products are commonly found on steam and

condensate systems. If installed correctly using good steam

engineering practices, it is perfectly safe. However, because

of its mechanical properties, it is less forgiving compared

to other materials such as SG iron or carbon steel. The

following are the good engineering practices required to

prevent waterhammer and ensure safe working conditions

on a steam system.

Safe Handling

Cast Iron is a brittle material. If the product is dropped during

installation and there is any risk of damage the product should

not be used unless it is fully inspected and pressure tested

by the manufacturer.

IM-P717-02-US Issue 1

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

Prevention of waterhammer

Steam trapping on steam mains:

Steam Mains - Do's and Don'ts:

30 - 50 metre intervals

Gradient 1:100

Trap set

Condensate

Steam

Flow Flow

Steam Steam

IM-P717-02-US Issue 1 5

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

Prevention of tensile stressing

Pipe misalignment:

Installing products or re-assembling after maintenance:

Do not over tighten.



Flange bolts should be gradually tightened across diameters to ensure even load and alignment.

4 2

Prevention of tensile stressing continued on next page

IM-P717-02-US Issue 1

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

Thermal expansion:

Limit

rods

Limit rods

Fixing point

Medium

distance

Small lateral

movement

Small lateral

movement

Short

distance Fixing point

Axial

movement

Axial

movement

Guides

Guides Guides

Guides

Large

lateral

movement

Large lateral

movement

Guides

IM-P717-02-US Issue 1 7

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

REMOTE

MANUAL SWITCH,

PROGRAM CLOCK,

TEMPERATURE SWITCH

OR PRESSURE SWITCH

ELECTRIC

POWER

Steam

Supply

Steam

Supply

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco 25E

Electric Control Valve

Condensate Return Line

Fin-Tube

Radiation

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Room

Thermostat

Spirax Sarco

Strainer

Spirax Sarco 25E

Electric Pilot

Operated Valve

STEAM TO

PROCESS

REMOTE

MANUAL SWITCH,

PROGRAM CLOCK,

TEMPERATURE SWITCH

OR PRESSURE SWITCH

ELECTRIC

POWER

Steam

Supply

Steam

Supply

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco 25E

Electric Control Valve

Condensate Return Line

Fin-Tube

Radiation

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Room

Thermostat

Spirax Sarco

Strainer

Spirax Sarco 25E

Electric Pilot

Operated Valve

STEAM TO

PROCESS

REMOTE

MANUAL SWITCH,

PROGRAM CLOCK,

TEMPERATURE SWITCH

OR PRESSURE SWITCH

ELECTRIC

POWER

Steam

Supply

Steam

Supply

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco 25E

Electric Control Valve

Condensate Return Line

Fin-Tube

Radiation

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Room

Thermostat

Spirax Sarco

Strainer

Spirax Sarco 25E

Electric Pilot

Operated Valve

STEAM TO

PROCESS

REMOTE

MANUAL SWITCH,

PROGRAM CLOCK,

TEMPERATURE SWITCH

OR PRESSURE SWITCH

ELECTRIC

POWER

Steam

Supply

Steam

Supply

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco 25E

Electric Control Valve

Condensate Return Line

Fin-Tube

Radiation

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Room

Thermostat

Spirax Sarco

Strainer

Spirax Sarco 25E

Electric Pilot

Operated Valve

STEAM TO

PROCESS

REMOTE

MANUAL SWITCH,

PROGRAM CLOCK,

TEMPERATURE SWITCH

OR PRESSURE SWITCH

ELECTRIC

POWER

Steam

Supply

Steam

Supply

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco 25E

Electric Control Valve

Condensate Return Line

Fin-Tube

Radiation

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Room

Thermostat

Spirax Sarco

Strainer

Spirax Sarco 25E

Electric Pilot

Operated Valve

STEAM TO

PROCESS

Steam to

process

Fig. 1 Automatic Control Valve Electrically Operated from Remote Station or Stations

REMOTE

MANUAL SWITCH,

PROGRAM CLOCK,

TEMPERATURE SWITCH

OR PRESSURE SWITCH

ELECTRIC

POWER

Steam

Supply

Steam

Supply

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco

1/2” TD-52L Trap

Spirax Sarco 25E

Electric Control Valve

Condensate Return Line

Fin-Tube

Radiation

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Spirax Sarco

Strainer

Room

Thermostat

Spirax Sarco

Strainer

Spirax Sarco 25E

Electric Pilot

Operated Valve

STEAM TO

PROCESS

Condensate return line

Fin-tube

radiation

Spirax Sarco

½" TD-52L trap

Fig. 2 Controlling Temperature of Greenhouse or Other Similar Buildings

Electric power

Spirax Sarco

½" TD-52L trap

IM-P717-02-US Issue 1

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

2. Installing the valve

Cap nut

Fig. 3

Sizes ½" - 2"

IM-P717-02-US Issue 1 9

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

IMPORTANT: Step by step instructions on the following pages should be read carefully

before installing the valve.

Unpack carefully

Do not lift the regulator by the electric pilot. Grasp the body of the valve firmly when lifting.

Piping

1. Typical hookup sketches as shown in Figures 1 and 2 will aid in planning a correct installation.

2. Before installing the valve make sure the piping is free of foreign material, scale, etc.

3. Make certain the arrow cast on regular valve body is pointing in the direction of flow.

4. Regulating valve should always be installed in a horizontal line. (See Figures 1 and 2)

Bypass

1. A bypass connection, as shown in Figures 1 and 2, is recommended so that the valve can be

serviced without shutting down the equipment.

2. The bypass valve should be the same size as the regulating valve.

Steam line drain trap

To insure proper operation of the valve and avoid premature wear, it is recommended that on steam

applications a steam trap be installed on the same supply line. (See Figures 1 and 2)

Pipeline strainers

1. It is strongly recommended that strainers be installed before the regulating valve and steam

traps. (Figures 1 and 2)

2. Make certain adequate clearance is provided for screen removal and blowdown connection

between strainer and regulating valve body.

IM-P717-02-US Issue 1

Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

Stop valves

All stop valves on the supply side, as well as on the downstream side of the regulating valve, should

be of the gate type so as to insure full rated capacity and good control.

Wiring

1. Check name plate on electric pilot for correct voltage and service conditions.

2. Wiring must comply with local and national electrical codes.

How it works

Normally, the main valve and electric pilot valve are closed. When the electric pilot is energized, pilot

valve will open allowing steam or air to pressurize main valve diaphragm chamber which opens main

valve fully. When electric pilot is de-energized, pilot valve closes and diaphragm chamber pressure

is relieved through control orifice. Main valve will close tight by the force of head spring and steam

or air pressure acting on valve head.

Type 25E Electric On-Off Regulator

1G 1H

Cap nut

Electrical signal

Electric pilot

Main valve

Solenoid

Orifice

Control pressure

Main diaphragm

Inlet

Fig. 4

Sizes 2½" - 4"

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