Bellows Single Seat Control Valve

Bellows Single Seat Control Valve

Leak-proof Design:Bellows seal prevents external leakage.
Precise Flow Control:Single-seat structure enables accurate regulation.
Reliable Sealing:Double sealing with bellows and packing
Stable Operation:Provides smooth and stable control performance.
Wide Application:Suitable for steam, gas, and liquid media.
Durable Construction:Designed for long-term reliable service.

Bellows Single Seat Control Valve

bellows single seat control valve is a kind of top guide structure valve. The body structure is compact. It has S–streamline fluid channel, small pressure drop loss, large flow, wide adjustable range.

The upper bonnet adopts bellows sealing structure, which can completely eliminate the possibility of leakage of process media from the movement gap of the stem, and it is one of the remarkable characteristics of bellows sealing valve. Due to the variability and prominence of the bellows element itself with the anti–aging property, this kind of control valve completely overcomes the weakness of packing sealing valve, such as packing aging and temperature difference sensitivity. Secondly, using the bellows – packing double seal structure, it has better safety and reliability.

Therefore, it is widely used in the automatic control system of highly toxic, highly corrosive, radioactive and other rare and special media.

The valve core has large guiding area and good vibration resistance. The control valve is equipped with multi–spring diaphragm actuator or electric actuator, and has compact structure, large output torque.

Standard Specification

ItemSpecification
MannerStraight Through Casting Ball Valve
Nominal Diameter16, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200 mm
Nominal PressureANSI Class 125, 150, 300; JIS 10K, 16K, 20K; PN 1.6, 4.0 MPa
Type of ConnectionFlange Type: FF, RF, RJ, TG, MFM; Weld Type: SW (40–50 mm), BW (65–200 mm)
The Material of Body and BonnetSCPH2/WCB, SCPH21/WC6, SCS13A/CF8, SCS14A/CF8M, SCS16A/CF3M; applicable within operating temperature and pressure ranges of titanium and other alloys
Bonnet MannerBellow Seal Type: −196 ~ +350°C
Gland MannerScrew Fastening Type
PackingV-type PTFE Packing, Graphite Packing
GasketPlain Type, Zigzag Type; Stainless Steel (SUS304, SUS316, SUS316L) and other alloys
Surface CoatingBlue (Epoxy). When the valve body material is stainless steel, coating is not applied

High Precision Core Cv Value (%CF, LCF)

Nominal DiameterSeat DiameterRated CvRated Stroke (mm)
15101.625
15122.525
1515425
2015425
20206.325
25206.325
25251025
32251025
32321725
40251025
40321725
40402425
50321725
50402425
50504025
65402440
65504040
65656340
80504040
80656340
808010040
100656340
1008010040
10010016040
1258010060
12510016060
12512525060
15010016060
15012525060
15015040060
20012525060
20015040060
20020063060

Actuator

ItemPneumatic Diaphragm TypeCylinder Piston Type (Single Action)Cylinder Piston Type (Double Action)Electronic TypeIntelligent Type
ModelZJHA/BZTCLSZTCL381 SeriesZM Series
StructureMultiple Springs TypeSingle ActionDouble Action
ServiceRegulationRegulationRegulationRegulationRegulation
Supply Gas Pressure / Supply VoltageSupply Gas Pressure (spring range): 280(80–240) kPa / 400(80–240) kPaSupply Gas Pressure: 400–700 kPa (300–500 kPa)Supply Gas Pressure: 400–700 kPa (300–500 kPa)Voltage: 220/380V 50Hz; Input Signal: 4–20 mA DCVoltage: 220/380V 50Hz; Input Signal: 4–20 mA DC
ConnectorAir Piping: RC1/4Air Piping: G1/8, G1/4, G1/2, G3/8Air Piping: G1/8, G1/4, G1/2, G3/8Wiring: PG13.5Wiring: PG13.5
Positive ActionAdding Pressure – Valve Will Be ClosedAdding Pressure – Valve Will Be ClosedAdding Pressure – Valve Will Be ClosedInputting the Signal – Valve Will Be ClosedInputting the Signal – Valve Will Be Closed
Negative ActionAdding Pressure – Valve Will Be OpenedAdding Pressure – Valve Will Be OpenedAdding Pressure – Valve Will Be OpenedInputting the Signal – Valve Will Be OpenedInputting the Signal – Valve Will Be Opened
Hysteresis≤3% FS (with positioner) / ≤3% FS (no positioner)≤3% FS (with positioner) / ≤3% FS (no positioner)≤3% FS (with positioner) / ≤3% FS (no positioner)≤ ±1% FS≤ ±1% FS
Limit of Intrinsic Error≤ ±3% FS (with positioner) / ≤ ±11% FS (no positioner)≤ ±3% FS (with positioner) / ≤ ±11% FS (no positioner)≤ ±3% FS (with positioner) / ≤ ±11% FS (no positioner)≤ ±1% FS≤ ±1% FS
Ambient TemperatureStandard: −30 ~ +70°C; High Temperature Type: 0 ~ +100°C; Low Temperature Type: −40 ~ +40°CStandard: −20 ~ +60°C; High Temperature Type: 0 ~ +100°C; Low Temperature Type: −50 ~ +60°CStandard: −20 ~ +60°C; High Temperature Type: 0 ~ +100°C; Low Temperature Type: −50 ~ +60°C−20 ~ +70°C−25 ~ +70°C
Painting ColorBlue Scale 10B5/10Blue Scale 10B5/10Blue Scale 10B5/10
AccessoryPositioner / Air Filtration / Pressure Reducing Valve / Transmitter / HandwheelPositioner / Air Filtration / Pressure Reducing Valve / Transmitter / HandwheelPositioner / Air Filtration / Pressure Reducing Valve / Transmitter / HandwheelIntegrated TypeIntegrated Type

Model Selection Parameter Table

Rated Flow Cv Value

Seat Diameter (mm)10121520253240506580100125150200
Equal Percentage1.62.546.31017244063100160250400630
Straight1.82.84.46.91117.627.54469110176275440690

Optional Coefficient of Flow Cv

(★ standard type • recommend type ○ customized type)

Nominal DiameterStroke10121520253240506580100125150200
DN2016 mm
DN2516 mm
DN3225 mm
DN4025 mm
DN5025 mm
DN6540 mm
DN8040 mm
DN10040 mm
DN12560 mm
DN15060 mm
DN20060 mm

Pneumatic Actuator Diaphragm Active Area Ae (cm²)

ModelActive Area
ZHA/B-22350
ZHA/B-23350
ZHA/B-34560
ZHA/B-45900

Allowable Pressure Differential of Metal Seal (MPa)

Range of Spring10121520253240506580100125150200
20–100 kPa4.463.091.981.160.700.440.280.180.170.110.070.070.050.03
40–200 kPa6.46.45.943.342.141.310.840.530.510.330.210.220.150.09
80–240 kPa6.46.46.46.44.993.051.951.251.180.780.500.510.360.21
Range of Spring10121520253240506580100125150200
20–100 kPa6.46.193.962.232.140.870.560.350.340.220.140.150.100.06
40–200 kPa6.46.46.46.46.45.863.642.302.211.430.910.950.660.37
80–240 kPa6.46.46.46.46.46.45.043.183.061.981.261.320.920.52

High Precision Flow Characteristic of Valve

Bellows Single Seat Control Valve

The Size of Control Valve and Hole Shrinkage Internals&trip; Rated Cv.

Valve Size (inch/mm)Rated Stroke (mm)CvCharacteristic10%30%50%70%100%
3/4 (20)161.6Equal %0.090.170.340.951.6
3/4 (20)161.6Straight0.270.681.091.491.8
3/4 (20)162.5Equal %0.140.270.531.482.5
3/4 (20)162.5Straight0.421.061.692.322.8
3/4 (20)164Equal %0.220.430.852.374
3/4 (20)164Straight0.671.662.653.654.4
1 (25)164Equal %0.220.430.852.374
1 (25)164Straight0.671.662.653.654.4
1 (25)166.3Equal %0.340.681.353.746.3
1 (25)166.3Straight1.052.604.165.726.9
1 1/4 (32)256.3Equal %0.340.681.353.746.3
1 1/4 (32)256.3Straight1.052.604.165.726.9
1 1/4 (32)2510Equal %0.551.082.145.9310
1 1/4 (32)2510Straight1.674.156.649.1111
1 1/2 (40)2510Equal %0.551.082.145.9310
1 1/2 (40)2510Straight1.674.156.649.1111
1 1/2 (40)2516Equal %0.871.733.429.4916
1 1/2 (40)2516Straight2.676.6310.6214.5817.6
2 (50)2516Equal %0.871.733.429.4916
2 (50)2516Straight2.676.6310.6214.5817.6
2 (50)2525Equal %1.362.725.3514.8225
2 (50)2525Straight4.1710.3716.5922.7927.5
2 1/2 (65)4025Equal %1.362.725.3514.8225
2 1/2 (65)4025Straight4.1710.3716.5922.7927.5
2 1/2 (65)4040Equal %2.184.328.5423.7140
2 1/2 (65)4040Straight6.6716.5826.5636.4644
3 (80)4040Equal %2.184.328.5423.7140
3 (80)4040Straight6.6716.5826.5636.4644
3 (80)4063Equal %3.346.8113.4537.3563
3 (80)4063Straight10.4726.0141.6357.1769
4 (100)4063Equal %3.346.8113.4537.3563
4 (100)4063Straight10.4726.0141.6357.1769
4 (100)40100Equal %5.4510.8121.3659.28100
4 (100)40100Straight16.6941.4666.3791.14110
5 (125)60100Equal %13.6210.8121.3659.28100
5 (125)60100Straight16.6941.4666.3791.14110
5 (125)60160Equal %21.8017.2934.1794.85160
5 (125)60160Straight26.7066.34106.2145.8176
6 (150)60250Equal %13.6227.0653.40148.2250
6 (150)60250Straight41.72103.7165.9227.9275
6 (150)60400Equal %21.8043.2385.42237.1400
6 (150)60400Straight66.75165.85265.5364.6440
8 (200)60250Equal %13.6227.0653.40148.2250
8 (200)60250Straight71.72103.7165.9227.9275
8 (200)60400Equal %21.8043.2385.42237.1400
8 (200)60400Straight66.75165.85265.5364.6440

The Material of Valve and Components, Range of Using Temperature · Allowable Leakage of Seat

Body Material: Carbon Steel

ComponentSpecificationSCPH2 / A216–WCBSCPH21 / A217–WC6SCPL1 / A352–LCB
CoreMaterialSUS304/316SUS304/316SUS304/316
CoreTreatmentR.TFESS/SF
SeatMaterialSUS304/316SUS304/316SUS304/316
SeatTreatmentSS/SF
Guide SleeveMaterialSUS420SUS420SUS420
Guide SleeveTreatmentHTHTHT
GasketMaterialSUS316LSUS316LSUS316L
Allowable Leakage of SeatANSIClass IVClass VIClass IV
Allowable Leakage of SeatRated CvX0.01%Non-leakage0.01%
Operating Temperature (°C)SCPH2 / WCB Body-17 ~ +350-17 ~ +230-17 ~ +350
Operating Temperature (°C)SCPH21 / WC6 Body-17 ~ +350-17 ~ +230-17 ~ +350
Operating Temperature (°C)SCPL1 / LCB Body-45 ~ +350-45 ~ +230-45 ~ +350

Body Material: Stainless Steel

ComponentSpecificationSCS13A / CF8SCS14A / CF8MSCS16A / CF3M
CoreMaterialSUS304/316/316LSUS304/316SUS304/316/316L
CoreTreatmentR.TFESS/SF
SeatMaterialSUS304/316/316LSUS304/316/316LSUS304/316/316L
SeatTreatmentSS/SF
Guide SleeveMaterialSUS304/316/316LSUS304/316/316LSUS304/316/316L
Guide SleeveTreatmentR.TFEST
GasketMaterialSUS316LSUS316LSUS316L
Allowable Leakage of SeatANSIClass IVClass VIClass IV
Allowable Leakage of SeatRated CvX0.01%Non-leakage0.01%
Operating Temperature (°C)-196 ~ +350-45 ~ +350-196 ~ +350

Allowable Differential Pressure

Multi-spring Diaphragm Actuator

Actuator SpecificationAir Pressure (kPa)Spring Range (kPa)3/4 (20)1 (25)1 1/4 (32)1 1/2 (40)2 (50)2 1/2 (65)3 (80)4 (100)5 (125)6 (150)8 (200)
ZJHA/B-2214020~1001.170.75
ZJHA/B-2224040~2002.731.75
ZJHA/B-2230080~2405.853.75
ZJHA/B-2314020~1001.641.050.630.400.26
ZJHA/B-2324040~2003.822.451.490.960.61
ZJHA/B-2330080~2408.195.243.192.051.31
ZJHA/B-3414020~1001.020.660.420.240.160.10
ZJHA/B-3424040~2002.381.530.980.580.380.24
ZJHA/B-3430080~2405.123.282.101.240.820.52
ZJHA/B-4514020~1000.400.260.170.110.070.02
ZJHA/B-4524040~2000.930.610.390.250.170.07
ZJHA/B-4530080~2401.981.320.840.540.370.16

381L Series of Electronic Actuator

Model / SpecificationVoltage Rating3/4 (20)1 (25)1 1/4 (32)1 1/2 (40)2 (50)2 1/2 (65)3 (80)4 (100)5 (125)6 (150)8 (200)
381LSA-08110V / 220V / 380V2.381.520.930.590.38
381LSA-08110V / 220V / 380V1.911.220.740.470.30
381LSA-20110V / 220V / 380V4.773.051.861.190.760.45
381LSA-20110V / 220V / 380V3.822.441.490.950.610.36
381LSB-30110V / 220V / 380V2.791.791.140.671.210.280.180.120.03
381LSB-30110V / 220V / 380V2.231.430.910.540.960.220.140.100.02
381LSB-50110V / 220V / 380V4.662.981.911.131.510.470.300.210.08
381LSB-50110V / 220V / 380V3.732.381.520.901.200.380.240.160.06
381LSC-65110V / 220V / 380V1.352.340.570.360.250.11
381LSC-65110V / 220V / 380V1.081.870.450.290.200.08
381LSC-99110V / 220V / 380V2.262.920.950.610.420.20
381LSC-99110V / 220V / 380V1.802.330.760.480.330.15
381LSC-160110V / 220V / 380V0.970.670.35
381LSC-160110V / 220V / 380V0.780.540.27

Outline Drawing

Bellows Single Seat Control Valve

Appearance Dimension

Unit:mm

DN (inch)DN (mm)ANSI150 PN16/25 (GB/T12221)ANSI150 PN16/25 (GB/T17213.3)ANSI300 PN40 (GB/T17213.3)ANSI600 PN64/100 (GB/T17213.3)H1H2H3Electrical ActuatorPneumatic Actuator
3/42015018419420640135274381LSA-20ZJHA/B-22
12516018419721043146274381LSA-20ZJHA/B-22
1 1/43218021023525145163302381LSB-30ZJHA/B-23
1 1/24020022223525156163302381LSB-30ZJHA/B-23
25023025426728673165302381LSB-30ZJHA/B-23
2 1/26529027629231183217375381LSB-50ZJHA/B-34
380310298317337102235375381LSB-50ZJHA/B-34
4100350352368394110236375381LSB-50ZJHA/B-34
5125400402425507146340465381LSC-99ZJHA/B-45
6150480451473508170340465381LSC-99ZJHA/B-45
8200600543568610220383465381LSC-99ZJHA/B-45

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