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  • koscn-SMV321

KOSCN Scientific SMV321 Manual Metal Diaphragm Valve

The KOSCN SMV321 Manual Metal Diaphragm Valve features a fully plastic, corrosion-resistant actuator and a valve body made from 316L stainless steel, chemically and mechanically polished for enhanced performance. The overall mechanical structure is optimized for durability. With a PN10 pressure rating, it's ideal for high-performance applications in organic solvent and pure fluid systems.

Applications:
• Water Treatment / Marine Engineering
• Circuit Boards / Semiconductor
• Biopharmaceuticals / Medical
• Power Generation / Renewable Energy
• Food & Beverage
• Specialty Chemicals

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Easy Installation and Maintenance

Easy Installation and Maintenance

  • Precise screw fit with clearance for smooth, maintenance-free operation.
  • Uniform installation length with international market valve standards.
  • Integrated visual position feedback for easy monitoring.
  • Adjustment module designed for ergonomics.
  • Handwheel features locking slots every 22.5° for precise control of opening and closing.
  • Welded valve seat design facilitates easy disassembly and reassembly.

High Safety Performance

  • Diaphragm stop with limit design for torque overload protection.
  • Suspended diaphragm coupling mechanism fully protects the diaphragm.
  • Handwheel adjustment module with integrated lock switch for lockout capability.
High Safety Performance
High Flexibility

High Flexibility

  • Welded and sanitary clamp connections.
  • Connection standards DIN 11850, ISO 1127, ASME-BPE.
  • Diaphragms in EPDM, EPDM-PTFE.
  • Valve body in SUS 316L.

Optimal Flow Performance

  • Valve installation ensures a specific angle with the horizontal line for complete drainage.
  • Superior flow path design for precise control and linear fluid characteristics.
  • Suitable for hygienic applications or media containing small particles and solids.
Optimal Flow Performance

Disassembled Components

NO Component Name
1 Pneumatic Actuator
2 Manual Actuator
3 Diaphragm
4 Valve Body
5 Locking Bolts
6 Smooth Flow Transition Channel
 

Size

Inch DN D DIN 11850-2 ISO 1127 DIN 11850 ASME BPE (DIN EN 558-1)
D S L D S L D1 D2 D3 L D1 D2 D3 L
1/2 15 65 19,0 1,5 108 21,3 1,6 108 16,0 19,0 34,0 108 9,40 12,7 25,0 108
3/4 20 65 23,0 1,5 117 26,9 1,6 117 20,0 23,0 34,0 117 15,75 19,0 25,0 117
1 25 87 29,0 1,5 127 33,7 2,0 127 26,0 29,0 50,5 127 22,10 25,4 50,5 127
1-1/4 32 87 35,0 1,5 146 42,4 2,0 146 32,0 35,0 50,5 146
1-1/2 40 135 41,0 1,5 159 48,3 2,0 159 38,0 41,0 50,5 159 34,80 50,8 50,5 159
2 50 135 53,0 1,5 190 60,3 2,0 190 50,0 53,0 64,0 190 47,50 63,5 64,0 190
Inch DN H H1 W1 W2
1/2 15 70 13 57 57
3/4 20 75 16 70 70
1 25 101 19 82 94
1-1/4 32 106 24 82 94
1-1/2 40 138 26 109 122
2 50 144 33 109 122
Unit：mm

How to Order

To order, please refer to the table below based on valve body material, air inlet mechanism, applicable pipe diameter, pressure, etc. Click on the product name to access the order number table. Refer to the order number table for the product number you wish to inquire about, and inform your sales representative during the inquiry. 
Butt-weld DIN 11850
d (mm) DN (mm) PN (bar)
 EPDM (per)
 EPDM-PTFE Sanitary Type
1/2
 15 10 321.920.5020 321.920.5020 321.920.5020F
3/4 20 10 321.920.5025 321.920.5025 321.920.5025F
1 25 10 321.920.5032 321.920.5032 321.920.5032F
1-1/4 32 10 321.920.5040 321.920.5040 321.920.5040F
1-1/2
 40 10 321.920.5050 321.920.5050 321.920.5050F
2 50 10 321.920.5063 321.920.5063 321.920.5063F
Butt-weld DIN 1127
d (mm) DN (mm) PN (bar)
 EPDM (per)
 EPDM-PTFE Sanitary Type
1/2
 15 10 321.920.5020 321.920.5020 321.920.5020F
3/4 20 10 321.920.5025 321.920.5025 321.920.5025F
1 25 10 321.920.5032 321.920.5032 321.920.5032F
1-1/4 32 10 321.920.5040 321.920.5040 321.920.5040F
1-1/2
 40 10 321.920.5050 321.920.5050 321.920.5050F
2 50 10 321.920.5063 321.920.5063 321.920.5063F
Clamp-on DIN 11850
d (mm) DN (mm) PN (bar)
 EPDM (per)
 EPDM-PTFE Sanitary Type
1/2
 15 10 321.920.5020 321.920.5020 321.920.5020F
3/4 20 10 321.920.5025 321.920.5025 321.920.5025F
1 25 10 321.920.5032 321.920.5032 321.920.5032F
1-1/2
 40 10 321.920.5050 321.920.5050 321.920.5050F
2 50 10 321.920.5063 321.920.5063 321.920.5063F
Clamp-on ASME-BPE
d (mm) DN (mm) PN (bar)
 EPDM (per)
 EPDM-PTFE Sanitary Type
1/2
 15 10 321.920.5020 321.920.5020 321.920.5020F
3/4 20 10 321.920.5025 321.920.5025 321.920.5025F
1 25 10 321.920.5032 321.920.5032 321.920.5032F
1-1/2
 40 10 321.920.5050 321.920.5050 321.920.5050F
2 50 10 321.920.5063 321.920.5063 321.920.5063F
 
Flow Capability

Flow Capability

Based on data at 20°C with clean water and a 1 bar pressure differential;
Cv = Kv X 0.07
Fv = Kv X 0.0585
Kv (l/min)
Cv (gal/min) US
Fv (gal/min) GB

Relative Flow Linearity Graph

The relative flow linearity coefficient refers to the variation of flow as a function of the valve's opening stroke.

 
Relative Flow Linearity Graph
Pneumatic Actuator Working Pressure

Pneumatic Actuator Working Pressure

The maximum control force required for diaphragms made of EPDM, PTFE material, based on actual driving data per size, see maintenance manual for details.

Maximum Tolerance Temperature

Plastic actuation mechanisms with pneumatic and manual control, standard design temperature resistance up to 80°C (176°F).

 
Maximum Tolerance Temperature
Actuator Functionality Features

Actuator Functionality Features

 

Actuator Air Consumption

The amount of compressed air needed for the valve to fully open or close under required driving pressure, measured in dm².

Actuator Air Consumption
Drive Air Source Connection

Drive Air Source Connection

  • Air source interface sizes: A air inlet G1/4, B air inlet G1/4
  • Normally Closed NC: Control pressure connected to B air side, valve opens
  • Normally Open NO: Control pressure connected to A air side, valve closes
  • Double Acting DA: Control pressure connected to A air side, valve closes; control pressure connected to B air side, valve opens
  • Electrical Control: NC/ NO actuators use a 3-way solenoid valve; DA actuators use a 5-way solenoid valve Note: The driving pressure for all actuators must not exceed the upper limit to ensure safe use and optimal functionality. Deviation in control pressure may lead to malfunction. In this case, a new actuator configuration is required.

KOSCN

KOSCN Industrial Manufacturing (Shenzhen) Co., Ltd., founded in 2005 and headquartered in Shenzhen, China, operates globally with subsidiaries and agent teams. It offers comprehensive pre-sales and after-sales services worldwide. KOSCN has a professional R&D, design, and production team, adhering strictly to ISO9001, ISO14001, and ISO45001 standards to ensure the highest product quality.

KOSCN's products, mainly automated valves for ultra-pure and corrosive systems, are widely used in semiconductor, glass panel, electroplating, wastewater treatment, waste liquid solidification, solar energy, landfill leachate, PCB, metallurgy, steel, ultra-pure water, recycling, chemical, food and beverage, power, paper, biopharmaceutical, and biofermentation industries.

KOSCN
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