Name: Motorized Butterfly Valve PN16 Cast Iron Nylon Disc EPDM
Brand: Supreme Valves India
SKU: BFV-PN16-MOTOR
Availability: InStock
Rating: 4.8 (127 reviews)

Question 1

What are the advantages of a nylon-coated ductile iron disc over stainless steel?

Accepted Answer

Nylon 11 (polyamide 11) coating on ductile iron provides several advantages over stainless steel discs in water and HVAC applications: (1) Corrosion resistance — nylon forms a continuous barrier against water and dissolved oxygen, preventing rust even if the coating is slightly damaged, (2) Low friction — nylon's self-lubricating surface reduces actuator torque requirements and extends seat life, (3) Erosion resistance — nylon resists impingement damage from suspended solids in raw water better than bare stainless steel in some cases, (4) Cost — typically 30–40% lower cost than SS316 disc for equivalent performance in water service, (5) Non-sparking — important for certain industrial water applications. The key limitation is temperature: nylon 11 coatings are typically limited to 80–100°C maximum.

Question 2

What is the difference between on/off and modulating electric actuators?

Accepted Answer

On/off actuators (also called open-close or spring-return) only operate in two positions: fully open or fully closed. They are driven by a simple binary signal (24V/110V/230V AC or DC). Modulating actuators (also called proportional or control) can position the valve disc anywhere between 0% and 100% open in response to an analog control signal — typically 0-10V DC or 4-20mA current loop. Modulating control allows precise flow regulation in HVAC, water treatment, and process control applications. The 0-10V signal is preferred for building management systems (BMS); 4-20mA is preferred for industrial process control due to its noise immunity over long cable runs.

Question 3

What does PN16 mean for a butterfly valve?

Accepted Answer

PN16 is a pressure class designation per ISO 7005 / EN 1092 / ASME B16.5 indicating the valve is rated for a maximum working pressure of 16 bar (232 PSI) at temperatures up to approximately 120°C. For water and HVAC applications at ambient temperatures (up to 60°C), the PN16 rating equals 16 bar in all practical terms. The PN (Pressure Nominal) system differs from Class ratings: PN16 is roughly equivalent to Class 150 for flanged valves, but the two rating systems use different reference temperatures and standards. Always verify the pressure-temperature curve for your specific service temperature.

Question 4

What is EPDM rubber seating and what are its advantages?

Accepted Answer

EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber widely used in butterfly valve seats for water, HVAC, and irrigation applications. Advantages include: excellent resistance to potable water and treated wastewater, broad temperature range (-30°C to +120°C), excellent UV and ozone resistance for outdoor installations, and a tight seal at low torque (reducing actuator sizing requirements). EPDM is NOT compatible with petroleum oils, fuels, or mineral oil-based lubricants — for oil service, NBR (Nitrile) seats are required. EPDM's flexibility also provides a degree of self-cleaning as the disc wipes the seat during each actuation cycle.

Question 5

How is the motorized butterfly valve controlled from a Building Management System (BMS)?

Accepted Answer

The modulating electric actuator communicates with the BMS via a 0-10V DC or 4-20mA analog signal. The BMS sends a voltage/current signal proportional to the desired valve position (e.g., 5V = 50% open for a 0-10V signal). The actuator's internal controller drives the motor to achieve and hold the requested position. Position feedback (a 0-10V or 4-20mA signal indicating actual valve position) is returned to the BMS for closed-loop verification. Many actuators also support Modbus RTU (RS-485) or BACnet IP communication for digital integration with modern building automation systems.

Question 6

What is the typical cycle life and maintenance requirement for motorized butterfly valves?

Accepted Answer

Quality motorized butterfly valves with EPDM seats typically achieve 10,000–50,000 mechanical cycles (open-close operations) under standard water service conditions. The electric actuator's mechanical life is typically rated at 20,000–100,000 cycles depending on the manufacturer. EPDM seats do not require lubrication and are not subject to corrosion. Maintenance is minimal: periodic visual inspection of the actuator wiring and shaft seals, and checking that the valve is not subjected to temperatures or pressures outside its rating. If the application involves dirty or scaling water, annual inspection of the seat and disc for deposits is recommended.

Component	Material Specification
Body & Bonnet	Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle	SS 410 / SS 420
Seat / Trim	EPDM / NBR / Bronze

Parameter	Specification / Standard
Manufacturing / Design Standard	EN 1171 / AWWA C509 / BS 5163
Testing Standard	API 598 / EN 12266-1
Pressure Rating	PN16 / PN25

Butterfly Valve PN16 CI Motorized

Motorized Butterfly Valve — PN16 — Cast Iron Body, Nylon-Coated DI Disc, EPDM Liner

Materials of Construction (MOC)

Technical Specifications