Spirax Sarco 25E User manual

IM-P717-02-US Issue 1 1
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
© Copyright 2023
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
2
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
4
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
Gradient 1:100
Trap set
Trap set
Trap set
Condensate
Condensate
Condensate
Steam
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.
1
1
4 2
3
8
2
6
3
7
5
4
Prevention of tensile stressing continued on next page

IM-P717-02-US Issue 1
6
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
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
8
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
2. Installing the valve
Cap nut
J
1D
1A
E
N
1E
1F
1G
1H
1C
H
G
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
10
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
J
1D
1A
E
1F
1G
1H
1C
G
H
1F
1G 1H
1C
E
GH
Cap nut
Electrical signal
Electric pilot
Main valve
Solenoid
Orifice
Control pressure
Main diaphragm
Inlet
Fig. 4
Sizes 2½" - 4"