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Spirax Sarco
Spirax Sarco
Two-Port Single SeatPN16/PN25/PN40Multiple Flow CharacteristicsWide Temperature RangeHigh RangeabilityFlanged Connection

Spirax Sarco KE71/KE73/KE43 Two-Port Control Valve

Spirax Sarco KE71/KE73/KE43 series two-port control valves, covering DN15-DN125, EN standard compliant with cage-guided seat design. Compatible with pneumatic or electric linear actuators for modulating or on/off control, suitable for various fluid control applications. Features equal percentage, linear, and quick opening flow characteristics, with metal or soft seal options, suitable for ambient to high temperature conditions, with 50:1 rangeability and high control accuracy.

Control Valves
Spirax Sarco KE73 Control Valve

Product Overview ​

Spirax Sarco KE71/KE73/KE43 two-port control valves are EN standard compliant cage-guided seat two-port single seat valves, covering sizes from DN15 to DN125. These valves can be paired with pneumatic or electric linear actuators for flexible modulating or on/off control, suitable for most fluid control applications, providing stable and reliable control across various flow conditions.

Spirax Sarco KE71/KE73/KE43 Two-Port Control Valve

Key Advantages

  • High Rangeability: 50:1 rangeability for precise flow control
  • Multiple Flow Characteristics: Equal percentage, linear, and quick opening options
  • Flexible Seal Options: Metal seal Class IV, soft seal up to Class VI
  • Wide Temperature Range: -10°C to 300°C for various applications
  • Rich Accessories: Compatible with multiple actuators and positioners

Valve Characteristics and Options ​

Flow Characteristic Options ​

CharacteristicDescription
Equal Percentage (E)Suitable for most fluid control applications, provides good control across various flow rates
LinearAdjusts flow in linear proportion
Quick OpeningAchieves high flow at small valve opening

Configuration Options ​

Option CategoryTypeApplication/Description
Stem SealPTFE Packing (Standard)Standard operating conditions
Stem SealGraphite PackingHigh temperature applications
SeatMetal Seal (431 SS, Standard)General applications
Seat316L SS Metal SealHigher corrosion resistance
SeatPTFE Soft SealTight shut-off, Class VI leakage
Seat316L SS with Stellite 6 HardfaceSevere service conditions
Bonnet TypeStandard BonnetNormal installation
Bonnet TypeExtended BonnetThick insulation or hot/cold applications
TrimStandard TrimGeneral flow control
TrimNoise Reducing CageNoise reduction required
TrimReduced Trim (Grade 1/2/3)Low flow control
TrimMicro-flow Plug (0.1/0.2/0.5)Precise low flow control

Technical Specifications ​

Core Technical Data ​

ParameterSpecification
Plug DesignParabolic
Leakage RateMetal Seal: Class IV; Soft Seal: Class VI
Rangeability50:1
StrokeDN15-DN50: 20 mm; DN65-DN100: 30 mm
Max Design Pressure16 bar g (@ 120°C)
Max Design Temperature300°C (with high temp packing/extended bonnet/bellows)
Min Design Temperature-10°C (consult manufacturer for lower temperatures)
Max Cold Hydraulic Test24 bar g (remove bellows for bellows sealed valves)
Operating Temperature LimitsPTFE Standard Packing: 250°C; PTFE Soft Seat: 200°C; High Temp Packing: 300°C

Kv Values ​

Standard and Reduced Trim Kv Values (20mm Stroke: DN15-DN50, 30mm Stroke: DN65-DN100) ​

Trim TypeCharacteristicDN15DN20DN25DN32DN40DN50DN65DN80DN100
Standard TrimEqual %4.06.310.016.025.03663100160
Standard TrimLinear4.06.310.016.025.03663100160
Standard TrimQuick Opening4.06.310.018.028.05085117180
Reduced Trim 1Equal %2.54.06.310.016.0253663100
Reduced Trim 1Linear2.54.06.310.016.0253663100
Reduced Trim 2Equal %1.62.54.06.310.016253663
Reduced Trim 2Linear1.62.54.06.310.016253663
Reduced Trim 3Equal %1.01.62.54.06.310162536
Reduced Trim 3Linear1.01.62.54.06.310162536

Micro-flow Plug Kv Values (DN15-DN25 Only) ​

Kv ValueDN15DN20DN25
0.50.50.50.5
0.20.20.20.2
0.10.10.10.1

Noise Reducing Trim Kv Values (Linear Characteristic) ​

Trim TypeDN15DN20DN25DN32DN40DN50DN65DN80DN100
Standard Trim468172027556390
Reduced Trim 13.556121315354060
Reduced Trim 2344.5777303340

Product Structure ​

Spirax Sarco KE71/KE73/KE43 Two-Port Control Valve - Structure

Materials ​

Part No.Part NameMaterial
1BodySG Iron EN-GJS-400-18u-LT
2BonnetSG Iron EN-GJS-400-18u-LT
2aExtended BonnetCast Steel BS EN 10213 GP240GH+N
3Stem Lock NutStainless Steel
4Bonnet Gasket316L / Spiral Wound Graphite
5Seat316L Stainless Steel
6Seat RingStainless Steel
7Seat Gasket316L / Spiral Wound Graphite
8Plug and StemStainless Steel
9*Lower Stem GuideGlass Filled PTFE
10Lower Stem ScraperPTFE
11*Packing Protector316L Stainless Steel
12*SpringStainless Steel
13Packing Spacer316L Stainless Steel
14*V-Ring Packing SetPTFE
15*Outer O-RingViton B
16*Upper Stem GuideGlass Filled PTFE
17*Inner O-RingViton
18Gland NutStainless Steel
19Dust SealPTFE
20Actuator Clamp NutZinc Plated Carbon Steel
21Bellows AssemblyStainless Steel AISI 316Ti + 316L
22Extended Bonnet Gasket316L / Spiral Wound Graphite
23Top Plate (Extended Bonnet Only)316L Stainless Steel
24Lower Spindle Guide Housing316L Stainless Steel
25Lower Spindle GuideStellite 6
26Spindle Lock and Anti-rotation Nut316L Stainless Steel
27Bonnet BoltsSteel BS 3692 Gr. 8 (High Temp: DIN 17240 25CrMo4)
28Bonnet NutsSteel BS 3692 Gr. 8.8 (High Temp: DIN 17240 25CrMo4)

Note: Parts marked with * are for PTFE sealed versions only. For high temperature packing, part 9 uses Stellite 6, part 14 uses graphite rings.

Dimensions and Weights ​

Spirax Sarco KE71/KE73/KE43 Two-Port Control Valve - Dimensions

Valve Dimensions (Approximate, mm) ​

Valve SizeA1 (Flange PN16)C1 (Flange PN16)C3 (Flange PN16)DE (Thread)
DN1513010333669M8
DN2015010333669M8
DN2516010333669M8
DN3218013235469M8
DN4020013235469M8
DN5023012734969M8
DN6529020141681M12
DN8031020141681M12
DN10035021643181M12

Valve Weights (Approximate, kg) ​

SizeKE73 Base WeightBellows Seal/Extended Bonnet Additional
DN155.54.5
DN206.84.5
DN257.04.5
DN3213.55.5
DN4014.05.5
DN5017.05.5
DN6535.010.0
DN8040.010.0
DN10054.013.0

Actuator Dimensions and Weights ​

Spirax Sarco KE71/KE73/KE43 Actuator Dimensions

Pneumatic Actuator Dimensions ​

Actuator ModelF (mm)G (mm)H (mm)J (mm)Weight (kg)With Handwheel (kg)
PN1500/PN25004051114--55-
PN1600/PN26004651116--70-
PN9100E Series275170552256+5.86
PN9100R Series2751701402256+2.50
PN9200E Series3003005522517+7.20
PN9200R Series30030014022517+3.77
PN9320E Series3253906535027+7.20
PN9320R Series32539015035027+3.77
PN9330E Series3353906535027+7.20
PN9330R Series33539015035027+3.77

Electric Actuator Dimensions ​

Actuator ModelF (mm)G (mm)Weight (kg)
EL560_1774604.5
EL561_1774604.8
EL562_1774605.2
EL563_1775067.0
EL564_22556910.0
EL565_22780720.0
EL506_1624458.7

Compatible Actuators and Positioners ​

TypeModel Series
Electric ActuatorsEL4600 Series, EL5600 Series
Pneumatic ActuatorsPN1000 Series, PN9000 Series
Pneumatic PositionerPP5
Electro-pneumatic PositionerEP5
Intrinsically Safe PositionerISP5
Smart PositionerSP400 Series, SP500 Series
Digital Communication PositionerSP300 Series

Selection Guide ​

Spirax Sarco KE71/KE73/KE43 Two-Port Control Valve - Selection Code

Selection Principles

When selecting KE73 control valves, determine size, flow characteristic, seal type, bonnet type and other configurations based on process requirements, and select appropriate actuators and positioners.

Model Code Rules ​

Selection ItemCode OptionsDescription
Valve SizeDN15-DN100Select based on requirements
Valve SeriesKK Series two-port control valve
Flow CharacteristicEEqual percentage (recommended default)
Body Material7SG Iron
Connection3Flanged
Stem SealP / B / C / HP=PTFE; B=Bellows/PTFE; C=Bellows/Graphite; H=Graphite
SeatT / G / S / WT=431 SS; G=PTFE Soft Seat; S=316L SS; W=316L+Stellite 6
TrimS / PS=Standard Trim; P=Noise Reducing Cage
Balanced TrimUUnbalanced
Bonnet TypeS / ES=Standard; E=Extended
BoltsSStandard
Series.2Fixed code

Selection Example ​

Model: KE73 PTSUSS.2 Kv10 PN16 Flanged

Configuration: DN25 size, equal percentage characteristic, SG iron body, flanged connection, PTFE stem seal, 431 SS seat, standard trim, unbalanced, standard bonnet, standard bolts, Kv10 flow coefficient, PN16 flanged connection.

Spare Parts ​

Spirax Sarco KE71/KE73/KE43 Two-Port Control Valve - Spare Parts

Standard Spare Parts (Non-Bellows Sealed) ​

Spare Part NameCodeNotes
Actuator Mounting NutA-
Gasket SetB, GFor non-bellows sealed
Stem Seal Assembly (PTFE)C-
Stem Seal Assembly (Graphite Packing)C1-
Plug, Stem and Seat Assembly (Equal %)D, EGaskets not included
Plug, Stem and Seat Assembly (Quick Opening)D1, EGaskets not included
Plug, Stem and Seat Assembly (Linear)D2, EGaskets not included

Bellows Sealed Spare Parts ​

Spare Part NameCodeNotes
Actuator Mounting NutA-
Gasket SetB, GFor bellows sealed
Stem Seal Assembly (PTFE)C-
Stem Seal Assembly (Graphite Packing)C1-
Plug, Stem and Seat Assembly (Equal %)D3, EGaskets not included
Plug, Stem and Seat Assembly (Quick Opening)D4, EGaskets not included
Plug, Stem and Seat Assembly (Linear)D5, EGaskets not included
Bellows Seal AssemblyF-

Spare Parts Notes

  • If reduced trim is selected, specify when ordering spare parts
  • Spare parts are identified by solid lines; dashed line parts are not available separately

Ordering Information ​

Ordering Requirements

When ordering, provide full product name specifying valve size, model, flow characteristic, seal type, seat material, bonnet type and other key configurations. If actuators and positioners are required, specify models and requirements separately.

Spare Parts Ordering Example ​

1 set PTFE stem seal assembly for Spirax Sarco DN25 two-port control valve KE73 PTSUSS.2KVS10.

For bellows sealed valves, specify "bellows sealed": 1 set PTFE stem seal assembly for Spirax Sarco DN25 two-port control valve KE73BTSUSS.2KVS10.

Installation and Maintenance Tips

  • Spare parts installation must follow the installation and maintenance guide provided with the product
  • For bellows sealed valves, remove the bellows assembly before hydraulic testing to avoid damage
  • For applications below -10°C, consult manufacturer for compatibility

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