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"

IM-P717-02-US Issue 1 11
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
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
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. 5
6" Size (25E, only)
Fig. 6

IM-P717-02-US Issue 1
12
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
Maintenance
General inspection
While a program of planned maintenance is always to be recommended, the 25E Regulator will give
long and trouble-free service is correctly selected, installed and kept reasonably free of dirt and foreign
matter. Dirt and foreign matter are most likely to collect during installation and later trouble can be
avoided by inspecting the installation a few days later. Check the following: Refer to Figures 3 and 4.
1. Clean all pipeline strainers (remove screens to clean).
2. Check the main valve seat and protective screen (1D).
3. Inspect and clean orifices (E) and (H).
4. Check all joints for leakage.
Electric pilot, inspection of solenoid and internal parts
(Refer to Figures 6 and 7)
1. Shut off steam supply to valve and turn off electrical power.
2. Unscrew solenoid housing nut and remove housing, coil, and housing base plate.
3. Base assembly (4J) is now accessible for removal with hexagon or adjustable open end wrench.
4. Valve head, spring ad seat are now accessible for inspection, cleaning and replacement, if
necessary. When replacing seat use compound on threads (remove excess).
Tighten to 75 in.-lb. torque.
5
4-H
4-K
Cap nut
4
FD
BEA
4-J 4-G
5
4-H
4-K
Cap nut
4
FD
BEA
4-J 4-G
Fig. 7

IM-P717-02-US Issue 1 13
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
Valve sizes ½" to 4"
Inspecting and replacing main valve head and seat (Refer to Figures 3 and 4)
1. Unscrew copper tubing connection at (J) and (N).
2. Remove main valve cover cap screws (1A).
3. Remove main valve cover, strainer, screen, and head spring.
4. Head can then be removed by simply withdrawing with pliers or similar tool.
5. Inspection should then be made to determine if scale or other foreign material prevented tight
closure of the head and seat.
6. If the head or seat shows signs of wear this can be cor- rected by grinding, using a fine grinding
compound (400 grit) providing the wear is not severe. Check for body erosion.
7. If it is necessary to replace the valve seat, this can be removed from the valve body using a
standard hexagon socket. (Valve sizes ½" to 2"). When replacing the valve seat, a new gasket
should be used to insure a tight joint. 2½" thru 6" valves contain raised lugs for removal and seal
metal-to-metal without a gasket. Replacment heads and seats should be lapped in.
Valves sizes ½" to 4"
Inspecting and replacing main Valve diaphragms (Refer to Figures 3 and 4)
1. Unscrew copper tubing connection at (G).
2. Remove main valve diaphragm bolts (1C).
3. This will allow the lower diaphragm case to be removed.
4. The 2 metal diaphragms (1H) should be inspected to insure that they have not become distorted
or possibly fractured as a result of abnormal operating conditions.
5. At the same time any accumulation of dirt or foreign mate- rial should be removed from the
diaphragm case.
6. The valve stem (1F) should also be checked to make sure it is free to move and that there is no
scale or foreign ma- terial lodged in the guide bushing.
7. Before reassembling diaphragms in ½" to 4" sizes, main valve head must be in place and held in
a closed posiiton with the return spring and main valve cover.
8. Make certain pressure plate (1G) is set properly.
9. Care should be taken in centering the diaphragms properly and equalizing bolt take-up uniformly.

IM-P717-02-US Issue 1
14
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
6" Valve (25E) only.
Inspecting and replacing main valve diaphragms, seat, and head
Assembly (Refer to Figure 5)
Diaphragms
1. Unscrew copper tubing connections (G) to lower diaphragm chamber.
2. Remove main valve diaphragm bolts (1C) and drop lower diaphragm case.
3. The 2 metal diaphragms (1H) should be inspected and replaced if they have become distorted
or fractured.
4. Clean any accumulation of dirt from the diaphragm case and orifice (H).
Servicing the main valve head and seat
5. Loosen the diaphragm plate set screw and remove the diaphragm plate (1G).
6. Remove the top cover bolts (1A). and cover.
7. Remove the stem and head assembly from the valve. Inspect the head and seat for wear.
8. Check for body erosion around the seat ring.
9. Replacement seats and heads should be lapped in, and minor wear can also be corrected by
lapping with 400 grit compound.
10. On reassembly be sure diaphragm plate (1G) is set at " and set screw securely tightened.
Spare parts kits
Spare parts kits and coils are available. Refer to:
TI-P717-09-US for ½" to 4" Main Valve
TI-1-1121-US for 6" Main Valve - 25-Series, Only.
TI-P235-02-US for Pilot Valves

IM-P717-02-US Issue 1 15
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
A
Head on Seat
1G
Pressure Plate
Adjustment & Locknut
Fig. 8
Note: In ½" through 4" sizes, top of valve must be completely assembled and head must be on seat
when measuring dimensions “A" and when reassembling diaphragms.
Size ½"
and
¾"
1" 1¼"
and
1½"
2" 2½" 3" 4" 6"
Dimension A " " " " " " ¼" 

IM-P717-02-US Issue 1
16
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
Troubleshooting - Type 25E and 26E
Symptom Cause Check and Cure
1. Valve does not close.
1. (a) Dirt under pilot valve
head or seat.
1. (a) Remove and, if
necessary, replace or
clean. See Figure 7.
(b) Dirt in orifices (E) or (H). (b) Inspect and clean.
(c) Dirt or foreign material
under main valve head
(1E).
(c) De-energize solenoid to
close pilot. Discon- nect
tubing at (G). Main valve
should close, if not,
remove bolts (1A) and
clean main valve.
(d) Faulty control circuit. (d) Check the electrical
system by energizing the
solenoid. A metallic click
signifies the solenoid is
open. Absence of the
click indicates loss of
power supply. Check
for loose or blown out
fuses, open circuited or
grounded coil, broken
lead wires or splice
connections.
(e) Actuating device, that
is, timer, thermostat or
programmer may be
defective.
(e) Check and correct.
(f) Bypass valve leaking (f) Check and correct.

IM-P717-02-US Issue 1 17
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
Symptom Cause Check and Cure
2. Valve does not open.
2. (a) Actuating device, that
is, timer, ther- mostat
or programmer may be
faulty.
2. (a) Check and correct.
(b) Main Valve diaphragm
(1H) cracked.
(b) Check and correct.
Remove copper tubing
at (G) and crack bypass
valve. If steam or air
blows from diaphragm
case at (G) connection,
replace diaphragm.
(c) Orifice at (H) blocked. (c) Check and correct.
Remove copper tubing
at fitting. Inspect and
clean.
(d) Valve strainer (1D)
blocked.
(d) Check and correct.
Remove bolts (1A).
Inspect strainer and
clean.
(e) Steam or air pressure
too low.
(e) Check and correct.
(f) Line strainer partially or
completely blocked.
(f) Check and correct.
Inspect and clean.
(g) Faulty control circuit. (g) Check the electrical
system by energizing the
solenoid. A metallic click
signifies the solenoid is
open. Absence of the
click indicates the loss
of power supply. Check
for loose or blown out
fuses, open circuited or
grounded coil, broken
lead wires or splice
connections.
(h) On steam applications,
steam trap draining
equipment may not be
functioning properly.
(h) Check and repair, if
necessary.

IM-P717-02-US Issue 1
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Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

IM-P717-02-US Issue 1 19
Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)

IM-P717-02-US Issue 1
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Type 25E and 26E Electric Pilot Operated Valve (for Steam or Air Service)
Spirax Sarco Applications Engineering Department
Toll Free at: 1-800-883-4411
SPIRAX SARCO, INC.
1150 NORTHPOINT BLVD.
BLYTHEWOOD, SC 29016
PHONE [phone]
FAX [phone]
www.spiraxsarco.com/global/us