Electric Plastic Butterfly Valves

UPVC & CPVC Chemical Class

The industry benchmark for cost-effective acid-alkali distribution and water treatment (DN50 to DN300). UPVC delivers outstanding resistance up to 60°C, while CPVC extends structural temperature ratings up to 95°C for hot corrosive pickling lines and electroplating baths.

• 100% pure virgin polymer resins with high impact resistance
• Full-boot EPDM or FKM (Viton) liner cushions disc shut-off
• Wafer body with multi-standard bolt alignment holes (ANSI/DIN/JIS)

PVDF & PPH High-Purity Class

Built for aggressive chemical synthesis, wet chlorine gas, and semiconductor UPW distribution. Natural unpigmented PVDF resists boiling acids and oxidizers up to 140°C, while PPH provides exceptional solvent and non-oxidizing acid resistance up to 100°C.

• Zero metallic ion extraction for high-purity cleanroom loops
• Low disc operating torque reduces actuator motor size and cost
• High-grade FKM (Viton) boot liner resists chemical swelling

100% Metal-Free Fluid Contact

The disc and liner completely insulate the 316SS or 410SS drive shaft from wetted fluid. Eliminates galvanic corrosion, rust, and acid pitting, providing maintenance-free longevity in harsh chemical lines.

Reinforced ISO 5211 Top Pad

Plastic valve necks can crack under actuator torsional shocks. DELCO molds heavy structural ribs and stainless steel threaded inserts directly into the top mounting pad, distributing motor torque loads safely.

60% Lighter Than Metal Valves

Weighing less than half of an equivalent ductile iron valve, plastic wafer valves ease overhead rigging, reduce structural pipe hanger costs, and eliminate sagging on lightweight plastic piping lines.

Universal Multi-Standard Bolt Holes

The wafer body features engineered scalloped bolt holes that clamp concentrically between ASME B16.5 Class 150, DIN PN10, and JIS 10K flanges, guaranteeing perfect pipe bore alignment without bolt binding.

Full-Boot Integrated Flange Gasket

The one-piece elastomeric liner wraps completely around the body face. Functions as an integral flange gasket, eliminating the expense and hassle of ordering separate flat gaskets during installation.

Fast Low-Power Actuation

Because polymer-on-elastomer friction is exceptionally low, actuators draw minimal electric current. Paired with compact IP67 actuators with visual position dome, manual override, and 4–20mA modulating options.

1. How do I choose between EPDM and FKM (Viton) boot liners in plastic butterfly valves?

• EPDM Liner: Best for general water utilities, sea water, wastewater, caustic soda (sodium hydroxide), and dilute acids up to 80°C. Never use EPDM with petroleum oils or hydrocarbons.

• FKM (Viton) Liner: Essential for aggressive concentrated inorganic acids (hydrochloric, sulfuric), chlorine solutions, fuels, and organic solvents up to 120°C.

2. How are flange bolts tightened safely on plastic wafer valves without cracking the body?

Because thermoplastics have lower compression strength than ductile iron, over-torquing flange bolts can crush the plastic body or cause disc binding. Flange bolts must be fitted with flat washers and tightened crosswise in progressive increments (1/3, 2/3, full torque) using a calibrated torque wrench, following DELCO recommended bolt torque tables.

3. Can plastic butterfly valves handle high-frequency throttling control?

Yes. The smooth surface finish of molded thermoplastic discs produces exceptionally low frictional resistance against the rubber liner. When paired with DELCO modulating electric actuators (4–20mA or 0–10V input), plastic butterfly valves provide smooth, stable flow throttling for acid/alkali neutralization tanks and cooling tower water balance.

4. Are separate flat flange gaskets required when installing plastic wafer valves?

No. DELCO plastic butterfly valves incorporate a full-boot elastomer liner that folds over both sealing faces of the valve body. When clamped between pipe flanges, the molded rubber faces act as built-in full-face gaskets, eliminating the need to purchase or install additional flange gaskets.