Introduction of High-speed Opening
and Closing Cylinder Valve
1. Introduction２-2）Good operating reliability

Conventionally, ball valves and butterfly valves have

Because of the internal structure is simplified and thebeen frequently used as automatic pneumatic valves

number of moving parts is reduced, the occurrence of

which can be opened and closed in a short time andtrouble is extremely low. In addition, since the entire

have low fluid flow resistance, but there have been

valve has a cylindrical shape has sufficient strength todifficulties in "durability and high-speed actuation".

withstand a sudden pressure load due to the water

Though these difficulties rarely become a problem inhammer phenomenon and does not malfunction.

normal conditions, they sometimes become problematic

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No.38

in rolling line’s cooling water switching valves in steel２-3）Compact and easy to handle

mills used in high frequency and high-speed operation.

As the valve incorporates a drive unit and is integrated,

The problem is that the valve seat seal part is in

it is compact, light, and easy to handle. Since the drive

sliding contact, and it is difficult to achieve good

unit does not protrude, the space for piping can besealing for a long time because the valve seat is worn

reduced, and there is no limitation on the mounting

and damaged due to the accumulation of theprocedure. Figure1 shows a sample image of aoperations. In addition, when the opening and closing

cylinder valve cut sample.

operation time is short, the sudden increase inpressure on the primary side of the valve due to thewater hammer phenomenon caused by sudden closing
causes damage to the valve seat seal, valve support
bearing, and operating stem and as a result, the valve
may become inoperable.
In this report, we introduce the High-speed opening
and closing cylinder valve, which was developed, andhas been manufactured and sold about 40 years ago,
has added value to solve these problems, and is still
being selected by our customers.
Figure1

2. Features

Cylinder valve with built-in drive unit

２-4）High-speed operation２-1）long sealing life

The moving parts are lightweight and have a shortSince the valve seat seal is not in sliding contact,

working stroke, enabling high-speed operation andthere is no deterioration in sealing performance due togood operability. Table1 shows a list of operatingfriction.

times for standard specifications.。

19Product Introductions

Table1Standard operating time of cylinder valve

OPERATION TIME（SEC.）FLUID
PRESSURE
OPERATIONNOMINAL SIZE

15A
20A
25A
32A
40A
50A
65A
80A
100A
125A
150A
200A
250A
300A
350A
400A
450A

0.98MPa

USE AIR APPARATUS（MADE BY KONAN ELE.）

1.96MPaSPEED
SOLENOIDCONTROLSHUTVALVE↓VALVEOPEN↓SHUTSHUT↓OPENOPEN↓SHUT

OPEN

0.10
0.11
0.140.21
0.21
0.33
0.30
0.34
0.44
0.68
0.94
1.7
2.4
2.6
3.1
3.4
4.8

0.10
0.10
0.12
0.19
0.19
0.28
0.26
0.29
0.38
0.59
0.81
1.5
2.0
2.1
2.6
3.1
4.5

0.10
0.13
0.17
0.26
0.26
0.43
0.36
0.42
0.57
0.85
1.2
2.1
3.1
3.5
4.0
3.8
5.3

0.10
0.10
0.12
0.17
0.17
0.26
0.25
0.27
0.35
0.54
0.74
1.3
1.8
1.9
2.4
2.8
4.1

3. Structure and Operation
The main components of the cylinder valve are themain body, the cap, and the piston, and the structure issuch that the seal material for each joint and themovable part seal is used. Figure3 shows the cross-

453S202CSC6-02-8A
413S302C

sectional diagram of the two-way cylinder valve. Also,a three-way cylinder valve can be made by attaching aT-shaped part to the primary side（body line flange

413S603C SC6-04-10Aside）of the two-way valve. Figure4 shows the crosssectional diagram of the three-way cylinder valve.
The piston moves to the valve seat side or the non-

413S604C SC6-04-15A

valve seat side by switching the operating air pressure
supplied to the cylinder（body）. When the piston

413S806C SC6-08-20A

moves to the valve seat side, the tip of the piston ispressed against the valve seat packing, sealing thefluid flowing through the main body flow path and theThe effect of internal fluid pressure on valve

inside of the piston, and the valve becomes“closed”.

operation is minimized, so the effective cylinder area

Next, when the operating air pressure is switched andis small. The amount of compressed air required forthe piston moves to the opposite side of the valve seat,

operation is less than the amount required to operate

the space between the tip of the piston and thea ball valve of the same size.

packing of the valve seat is opened as a flow path, andthe fluid flows through the main body flow path andWinter 2020２-5）Low air consumption２-6）Low fluid flow resistanceIn a valve where the valve seat does not make sliding

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contact（eg a globe valve）, the flow resistance is large
because the flow direction of the fluid changes severaltimes, but the flow direction of the cylinder valve issmall. In addition, since the flow path is streamlined,
the flow resistance is small and can be used for
relatively large flow applications. Figure2 shows therelationship between the Cv value, differential
pressure and flow rate of the two-way valve.
Figure3

Cross-section diagram of 2-way cylinder valve

Figure4

Cross-section diagram of 3-way cylinder valve

flow rate

Figure2 R elationship between Cv value, differential pressure,and flow rate20

Introduction of High-speed Opening and Closing Cylinder Valvethe cap flow path through the piston inner part andspeed opening and closing, automatic valve

the valves becomes“Open”.

5-1-2）PSA type nitrogen gas generator

The opening and closing state of the valve can beGas switching valve for PSA type large mounted

easily checked visually with an opening and closing

nitrogen gas generator.

indicator attached to the piston. In addition, byCustomer needs: sealing life, sealability, high-speed

attaching an operation bar to the opening and closing

opening and closing, automatic ON-OFF valve

instruction rod, it is possible to detect the opening andclosing state using limit switches and proximity5-2）Examples of new applications

switches, and to attach a positioner and control valves.

Recent application examples are introduced below.
5-2-1）Theme Park fountain equipment

4. Standard Specifications

Cylinder valves are used as ON-OFF and control

The standard specifications of the cylinder valve arevalves for fountain effects. The fountain flow rate

as follows.

control with high-speed opening and closing■ Wetted metal material … SCS13, SUS304

contributes to a more expressive show than ever

■ Packing material…… ‌NBR, AU（Select others

before.

depending on the fluid）■ Connection… ……… ‌JIS 10k, 20k flanges（CLASSWinter 2020
No.38

Used for shows including fountains in theme parks.

150 is also acceptable）

Customer needs : operation reliability, high-speed
opening and closing, automatic ON-OFF valve, controlvalve■ Size… ……………… Nominal size 15 A〜450 A5-2-2）Factory Wastewater Equipment Filter■ Sealing life… ……… 500,000 cycles

Factory wastewater is discharged outside the factory■ Max. operating pressure …… According to Table2

when it meets the standards through a filter. The■ Operation Air Pressure …… 0.4〜0.7MPa

wastewater dust adheres to the filter and filtering■ ‌Operating temperature range

ability may deteriorate if it is used continuously.

…… Depends on packing material（Consultation required）

Therefore, dust is removed by air blow, but if the ON-Table2

OFF valve is used frequently, air leaks inside and theMaximum operating pressure of cylinder valveline must be stopped to perform maintenance.

NOMINAL
PRESSURE

MAX.ALLOWABLE
WORKING PRESSURE

2 WAY
VALVE

10K

1.37MPa

20K

3.33MPa

applications, but the sealing life is short because the3 WAY
VALVE

10K

0.98MPa

valve seat is sliding contacts. The adoption of a20K

2.45MPa

cylinder valve can contribute to improving theNote : In case of 20k, 15A to 25A, both 2-way valve and 3-way valve
are 1.97MPa.

5. Applications５-1）Main application
The steelworks and PSA type nitrogen gas generator,

ON-OFF ball valves are usually used in the above

operation rate of wastewater facilities and reducing
maintenance man-hours.
Customer needs : sealing life, automatic ON-OFF valve

6. Conclusion

which were the development purposes, are the main

In this report, we introduced the High-speed opening

applications.

and closing cylinder valve, which solves the5-1-1）Steelworks（including non-ferrous metals）

customer's difficulties / problems（= challenges）withThick plate and hot rolling line product, cooling rollour reliable seal valve technology solution（= providesswitching valve.

value）.We believe that our customers continue to use

Customer needs: sealing life, operation reliability, high-our products because our products maintain high21

Product Introductions

quality. It is a realization of the fact that our name
"Valqua" comes from "Value & Quality". We willcontinue to explore the potential needs of customers
and provide solutions to build a win-win relationshipwith customers.

7. References1）‌Japan Valve Manufacturers’Association: New
Edition Valve Handbook, 368-370（2011）2）‌Masahiro Kitazawa: Valve Technical Report No. 52,80-81（2004）

Satoru Murayama
H&S Sales Group
Technical Solutions Division

Winter 2020No.3822