Kitz Y Series User manual

Document No.:KE-0015-00
Operation Manual
For
Flanged and Threaded
YStrainer
U Strainer
Lead-free Cored Bronze Threaded Y Strainer shall be covered by the separate manual.
Thank you for having chosen KITZ products.
For safe and trouble-free function and performance of the
product, ensure to read and understand all items of this manual
before valve mounting and operation.
Keep this manual in a convenient place for your valve operators’
easy access.

Document No.:KE-0015-00
This manual covers the normal use of Flanged and Threaded Y Strainer, and U Strainer, as a general
guidance to users.
This manual is prepared for manual valve operation.
For electric or pneumatic valve operation, refer to the operation manual prepared by the
manufacturers of relevant valve actuators.
CAUTION AND WARNING
To ensure safe and trouble-free function and performance of the product, please read all items of
this manual before handling, transportation, mounting and operation of valves. Keep this manual
in a convenient place for your valve operations’easy access.
The signal words “WARNING”and “CAUTION”are defined as follows:
Indicates a potentially hazardous situation which, if not avoided, will result
in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTES TO USERS
This manual covers the normal usage of the product. Technical data and instructions for operation,
maintenance and inspection of the product are prepared in consideration of safety. However, they
are good only to cover typical applications as a general guideline to users. If technical assistance
beyond the scope of this manual is required, contact KITZ Corporation or its distributors.
The illustrations given in this manual do not introduce all details. If more detailed data are needed,
refer to our relevant valve assembly drawings.
※Any information provided in this operation manual is subject to revision at any time without
notice. This edition cancels all previous issues.

Document No.:KE-0015-00
C O N T E N T S
Sheet
ⅠConstruction and Design Features･･･････････････････････････ 1
ⅡShipping, Handling and Storage ････････････････････････････ 10
ⅢStrainer Installation･････････････････････････････････････････ 13
ⅣOperation and Maintenance ････････････････････････････････ 23
ⅤCleanup, Wash and Maintenance ･･･････････････････････････ 27
ⅥPeriodic Inspection and Maintenance ･･････････････････････ 30
ⅦDisassembly and Reassembly････････････････････････････････ 33

Document No.:KE-0015-00 Sheet:1/37
CHAPTER Ⅰ
Construction and Design Features

Document No.:KE-0015-00 Sheet:2/37
Ⅰ Construction and Design Features
1. Flanged Y Strainer
1.1 The typical Y strainer design is as illustrated below.
1.2 The Y strainer is designed to remove foreign objects by the screen equipped inside the
strainer. Its flow direction and installation orientation are determined by its structure.
This illustration represents a typical construction.
Body
Screen
Cap
Plug
Gusket
Flange

Document No.:KE-0015-00 Sheet:3/37
Ⅰ Construction and Design Features
2. Threaded Y Strainer
2.1 The typical Y strainer design is as illustrated below.
2.2 The Y strainer is designed to remove foreign objects by the screen equipped inside the
strainer. Its flow direction and installation orientation are determined by its structure.
This illustration represents a typical construction.
Body
Screen
Gasket
Cap Plug

Document No.:KE-0015-00 Sheet:4/37
Ⅰ Construction and Design Features
1. U Strainer
1.1 The typical U strainer design is as illustrated below.
1.2 The U strainer is designed to remove foreign objects by the screen equipped inside the
strainer. Its flow direction and installation orientation are determined by its structure.
This illustration represents a typical construction.
Body
Screen
Gasket
Cap
Plug
Flange

Document No.:KE-0015-00 Sheet:5/37
Ⅰ Construction and Design Features
4. Types and Product Code
Our standard strainers are summed up as follows.
Type Nominal
Pressure End connection Body Material Product Code
Bronze Y，YK
Lead-free
bronze YNK
Ductile iron 10FDY，10FDYK
Thread
PVC VY
Cast iron 10FCY，10FCYC，10FCYN，10FCYK
10FCYCK，10FCYNK
Ductile iron 10FDYB，10FDYBF，10FDYBFK
Stainless
steel UYB，UYBM，10UYA，10UYAM
Flange
Carbon steel 10SCY
Bronze CY，CYK
Solder Lead-free
bronze CYNK
10 K
Socket weld ＰＶＣ VYS
125 LBS Flange Cast iron 125FCY
Thread Ductile iron 16FDY，16FDYK
16 K Flange Ductile iron 16FDYB，16FDYBK
Ductile iron 20FDY
Thread Stainless
steel UY，UYM
Ductile iron 20FDYB
Stainless
steel 20UYA
Ｙ
Type
20 K
Flange
Carbon steel 20SCY
U
Type 10 K Flange Cast iron 10FCU，10FCUK

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Ⅰ Construction and Design Features
5. Specification
(1) The products used under the control of the High Pressure Gas Safety Law, Gas
Utility Industry Law and Fire Service Law are subject to the regulation of these
laws. Select correct strainers which are in full compliance with these laws.
Facilities which use these strainers are also required to meet the relevant laws
and regulations. Failure of using the appropriate products required by the standard
or regulations may lead to the occurrence of the major accidents. The operators
may be legally punished as a result of the violence of the requirements.
(2) Each strainer has a different characteristic in the application, maximum permissible
working pressure and temperature, and pressure loss. Select appropriate strainers
in accordance with the service conditions. Improper selection of products may lead
to the occurrence of accidents.
(3) In order to have strainers working most efficiently, the strainer bore size should
correspond to the pipe bore size. If the bore size of strainers is smaller than that
of pipes, the pressure loss will increase and the specified pressure may not be
maintained. Determine pipe nominal diameters not to exceed the service
conditions specified in Section 5.2.
5.1 Maximum Permissible Working Pressure and Temperature
Product Code Service Conditions Max. Permissible
Working Pressure
Y Steady Flow at 120℃ and lower （Size 2”and smaller）
Steady Flow at 120℃ and lower（Size 21/2”and smaller）
Contact KITZ for saturated steam service.
1.6 MPa
1.37 MPa
YNK Steady Flow at 85℃ and lower
Pulsating Flow at 85℃ and lower 1.4 MPa 1.0 MPa
YK Steady Flow at 85℃ and lower 1.4 MPa
CY Steady Flow at 120℃ and lower 1.37 MPa
CYK Steady Flow at 85℃ and lower 1.4 MPa
CYKN Steady Flow at 85℃ and lower
Pulsating Flow at 85℃ and lower 1.4 MPa 1.0 MPa
10FCY
10FCYK Steady Flow at 120℃ and lower Pulsating Flow, oil*1 or air at 120℃ and lower
Saturated Steam
Gas*2 at 120℃ and lower
1.37 MPa
0.98 MPa
0.69 MPa
0.20 MPa
10FCYC
10FCYCK Steady Flow at 40℃ and lower Pulsating Flow or Oil*1 at 40℃ and lower 1.37 MPa 0.98 MPa
10FCYN
10FCYNK Steady Flow at 60℃ and lower Pulsating Flow or Oil*1 at 60℃ and lower 1.37 MPa 0.98 MPa

Document No.:KE-0015-00 Sheet:7/37
Ⅰ Construction and Design Features
Product Code Service Conditions Max. Permissible
Working Pressure
10FDY
10FDYK Steady Flow at 120℃ and lower Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower
（For 2”and smaller, Maximum temperature shall be limited
to 200℃.）
1.37 MPa
0.98 MPa
10FDYBF
Steady Flow at 120℃ and lower Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 300℃ and lower
（For 11/2”and smaller, Maximum temperature shall be
limited to 200℃.）
1.37 MPa
1.18 MPa
0.98 MPa
10FDYBFK
Steady Flow at 120℃ and lower Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 260℃ and lower
（For 11/2”and smaller, Maximum temperature shall be
limited to 200℃.）
1.37MPa
1.18 MPa
1.07MPa
10UYA
10UYAM Steady Flow at 120℃ and lower Steam at 180℃ and lower 1.37MPa 1.18MPa
UYB
UYBM Steady Flow at 120℃ and lower Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower
1.37MPa
0.98MPa
10SCY
Steady Flow at 120℃ and lower Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 300℃ and lower
1.37MPa
1.18MPa
0.98ＭＰａ
VY Water, Chlorine, Bromine or other chemical fluids at 50℃
and lower. 0.98MPa
VYS Water at 50℃ and lower. 0.98MPa
125FCY Water, Oil*1 or Gas at 120℃ and lower
Saturated steam 1.37MPa 0.86MPa
16FDY
16FDYK Steady Flow at 120℃ and lower Pulsating Flow, Steam, Oil*1, Gas or Air at 200℃ and lower 2.16MPa 1.96MPa
16FDYB Steady Flow at 120℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 300℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 350℃ and lower
（For 11/2”and smaller, Maximum temperature shall be
limited to 200℃.）
2.16MPa
1.96MPa
1.77MPa
1.57MPa
16FDYBK Steady Flow at 120℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 260℃ and lower
（For 11/2”and smaller, Maximum temperature shall be
limited to 200℃.）
2.16MPa
1.96MPa
1.86MPa
20FDY
20FDYB Steady Flow at 120℃ and lower Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 300℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 350℃ and lower
2.75MPa
2.45MPa
2.26MPa
1.96MPa

Document No.:KE-0015-00 Sheet:8/37
Ⅰ Construction and Design Features
Product Code Service Conditions Max. Permissible
Working Pressure
UY, UYM Pulsating Flow, Steam, Oil*1, Gas or Air at 180℃ and lower 1.96MPa
20UYA Steady Flow at 120℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower 3.33MPa 3.04MPa
20SCY Steady Flow at 120℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 220℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 300℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 350℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 400℃ and lower
Pulsating Flow, Steam, Oil*1, Gas or Air at 425℃ and lower
3.33MPa
3.04MPa
2.84MPa
2.55MPa
2.26MPa
1.96MPa
10FCU
10FCUK Steady Flow at 120℃ and lower Oil*1or Air at 350℃ and lower 1.37MPa 0.98MPa
＊ １ Oil refers to lubricant and operating fluid
＊ ２ Toxic or inflammable gases specified in the High Pressure Gas Safety
Law are excluded.
5.2 Service Conditions for each fluid. Be consulted by KITZ for other conditions.
Fluid Viscosity Velocity
Air ―30m/s
Stea, ―30m/s
Water 1mＰa・s or lower 4m/s or lower
2mＰa・s or lower 2m/s or lower
Viscous fluid 3mＰa・s or lower 1.5m/s or lower
Differential pressure shall be limited to 0.1MPa in case the screen is clogged.

Document No.:KE-0015-00 Sheet:9/37
Ⅰ Construction and Design Features
6．Standard Screen
(1) The pressure loss of strainer is almost proportionate to the screen openings.
However in case foreign particles are piled up in the screen or perforations or mesh
is clogged, the pressure loss will increase. The screen needs to adequately be
cleaned up and washed in order to secure the specified pressure.
(2) Select screens with a proper material and mesh to the fluids to secure the specified
pressure and velocity. Improper selection of the screen may lead to the operational
malfunction.
(3) Screen openings may differ depending on the thickness of wire, even if their meshes
are same. Take screen openings into consideration, when selecting screens.
6.1 Specification of KITZ Standard Strainer Screen
Strainer Type Standard Specification Option
Bronze, Cast Iron, Ductile Iron
(Excluding Class 20K) Y Strainer
６０°Perforated Stainless Steel
Sheet
（25.4÷A(diameter)＝MESH
Equivalent）
６０°Perforated Stainless Steel Sheet
with the net
（２０・３０・４０・６０・８０・１００ MESH）
Ductile Iron (Class 20K), Stainless
Steel, Carbon Steel Y Strainer
４０ MESH
（Stainless Steel Wired Mesh
reinforced by perforated sheet.）
２０・３０・６０・８０・１００ Mesh
（Stainless Steel Wired Mesh reinforced
by perforated sheet.）
Cast Iron U Strainer
６０°Perforated Stainless Steel
Sheet
（25.4÷A(diameter)＝MESH
Equivalent）
6.2 KITZ Standard Screen Openings
Nominal Dia.
(mm) A（φ） P（mm）MESH
Equivalent
Screen
Openings
（％）
Y Strainer
8〜50
65〜125
150・200
250・300
1.4
1.5
3.0
5.0
2.4
2.5
5.0
7.0
18
17
11
5
28.5
32.7
32.7
46.4
U Strainer 50〜100 1.5 2.5 17 32.7

Document No.:KE-0015-00 Sheet:10/37
CHAPTER II
Shipping, Handling and Storage

Document No.:KE-0015-00 Sheet:11/37
II Shipping , Handling and Storage
1. Shipping and Handling of Strainers
1.1 Care for Shipping and Handling of Strainers
(1) Keep off the strainer lifting area to prevent personal injury caused by
unsecured strainer.
(1) Take care not to damage coated surface of valves during shipment, which
may subsequently cause corrosion to valves. Any damaged surface should be
adequately repaired before installation.
(2) Carefully handle and store the strainer packed in carton cases, High humidity
may damage carton cases and affects the product quality.
1.2 Shipping and Handling of Strainers
1.2.1 Maintain original packing condition during shipment.
1.2.2 Handle strainers carefully so that they may not fall or drop on the ground. Any
extraordinary mechanical impact should be avoided.

Document No.:KE-0015-00 Sheet:12/37
II Shipping , Handling and Storage
2. Storage
2.1 Care for valve storage
(1) DO NOT storage strainers in the corrosive environment, which may cause
corrosion on threaded portions of strainers.
(2) DO NOT fall, drop, give mechanical impact or place any objects on strainers,
and DO NOT step on them. Overloading may damage strainers.
(3) DO NOT carelessly pile up products to avoid risk of product damage and
personal injury caused by unstable piling.
2.2 Storage
2.2.1 Store strainers in a dust-free, low humidity and well ventilated place. Indoor storage is
recommended.
2.2.2 Storing valves directly on the ground or the concrete floor is not recommended. Place
packed strainers on the pallets or the racks for storage.
2.2.3 In order to protect strainers from the intrusion of foreign objects, maintain original
packing condition until the strainers are installed.
2.2.4 Take appropriate measures to protect strainers from direct exposure to dust, rain and
sunlight, when strainers are inevitably stored outdoors.

Document No.:KE-0015-00 Sheet:13/37
CHAPTER III
Strainer Installation

Document No.:KE-0015-00 Sheet:14/37
III Strainer Installation
1. General Precaution
(1) Keep a secure footing installation and operation of valve.
(2) Sufficient lighting should be available at all times for valve operation.
(3) Piping should be properly supported, as needed.
(4) PVC Strainers are excellent for use in any weather. However, an appropriate
measure should be taken to avoid direct sunlight.
1.1 Allow a sufficient room for safe and easy operation and subsequent maintenance
such as the removal of the cap or screen of strainers.
1.2 Take appropriate measures for smooth operation, inspection and maintenance of
strainers if they are forced to be installed in small spaces.
1.3 Try not to install valves in the places where valve functions may be disturbed by
external forces such as vibrations.

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III Strainer Installation
2 For Safe Installation
(1) Keep off the strainer lifting area to prevent personal injury caused by
unsecured strainer.
(1) Take care not to damage threads or flange surface of strainers and flanges.
(2) DO NOT disassemble strainers during installation.
(3) Strainers should be mounted in accordance with arrows indicated on the valve
body. It is not recommended to install strainers in the vertical pipeline with the
flow oriented upward. The screen will not properly work in this position.
(4) Use an appropriate seal tape in threaded areas with the temperature and type
of service taken into consideration.
(5) DO NOT apply a pipe wrench to strainers. Use an appropriate tool such as a
spanner.
(6) When installing strainers, apply a spanner to the strainer end which was
screwed into the pipe end.
(7) DO NOT apply excessive torque to screw a strainer into the pipe so that the
pipe end will not damage the strainer threads.
(8) Take care not to catch fingers or hands during installation.
(9) Tighten threaded PVC Strainers into the pipes tight enough not to cause leak.
DO NOT overly tighten the strainer, which may damage the strainer ends.
(10) Use plastic valve sockets in the pipe ends when installing PVC Strainers to the
pipes. Metal threads may damage PVC Strainers.
○×

Document No.:KE-0015-00 Sheet:16/37
III Strainer Installation
3. Check the following items before the installation of strainers.
3.1 The service conditions should be within the range of the relevant strainer
specification.
3.2 Strainer threads should correspond with pipe threads.
3.3 No damage should be found on both strainer and pipe threads.
3.4 Make sure that pipe threads comply with the relevant standards by using thread
gauges.
3.5 Before installation of strainers, the connecting pipes should be cleaned to remove
cutting oil, cuttings or other foreign objects.
3.6 Do not give extraordinary shock to strainers by throwing, dropping, dragging or
toppling them down.
3.7 Remove end covers from strainers just before installation.
3.8 Check all threaded areas after installation and retighten them, if needed.

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III Strainer Installation
4. Installation Procedures for threaded strainers
4.1 Ensure that pipe ends are threaded.
4.2 Clean the end threads of strainers and the inside of connecting pipes with detergent and
cleaning cloth to remove all foreign objects such as cuttings and oil.
4.3 Apply sealing paste or tape in the threaded areas of pipes.
4.4 Use appropriate tools to thread strainers into pipes.
4.5 DO NOT apply excessive torque, when threading strainers into pipes. Torques should
not exceed the value shown below.
Strainer Size 1/8 1/4 3/8 1/2 3/4 1
N-m 20〜29 20〜29 20〜29 20〜29 39〜49 49〜59
Strainer Size 1-1/4 1-1/2 2 2-1/2 3 or
larger
N-m 59〜69 69〜78 78〜88 108〜118 127〜137
4.6 Gradually increase the pressure and temperature of pipeline,, when conducting the
pipeline test. Retighten all threaded areas of valves, if needed.