Electric Plastic Ball Valves

True Union Double-Nut Series

Engineered for high-maintenance chemical dosing and skid automation (DN15 to DN100 / 1/2" to 4"). Dual union lock-nuts allow the central valve body to be removed from the pipeline for seat servicing or cleaning without cutting or disassembling adjacent pipe runs.

• End connections: Socket cement, female NPT/BSPT threads, or butt-weld
• Integral body footpad for secure field pipe anchoring
• Bidirectional sealing with self-adjusting PTFE ball seat carriers

Industrial Flanged Plastic Series

Designed for heavy-bore industrial chemical effluent and distribution mains (DN50 to DN200 / 2" to 8"). Manufactured with solid one-piece molded flanges or heavy-duty stub ends compliant with ASME B16.5 Class 150 and DIN PN10 drilling standards.

• Robust flanged body profile resists line thermal stress and vibration
• Full-bore design delivers maximum flow rate with minimal pressure drop
• Available in pure PPH, PVDF, and heavy-wall CPVC constructions

100% Metal-Free Wetted Purity

Every internal component in contact with fluid is molded from pure virgin polymers (UPVC, CPVC, PVDF, PPH) and resilient PTFE/FKM. Eliminates metal ion leaching in ultra-pure deionized water and prevents acid chemical attack.

Reinforced ISO 5211 Top Flange

Standard plastic valves can suffer neck cracking under dynamic motor cycling. DELCO incorporates a heavy-duty reinforced ISO 5211 mounting bracket with brass/stainless threaded inserts to dissipate actuator torque loads safely.

True Union In-Line Maintenance

The double-union nut system allows plant operators to quickly unthread and slip the valve body out of the piping line. Simplifies periodic seat replacement, O-ring inspection, and line flushing without disrupting fixed pipe supports.

PTFE Seats with Cushion O-Rings

Machined virgin PTFE seats are backed by dual elastic EPDM or FKM (Viton) O-rings. This spring-cushion effect maintains continuous sealing contact against the polished thermoplastic ball, ensuring bidirectional ANSI Class VI bubble-tight shut-off.

Ultra-Pure Cleanroom PVDF Option

For semiconductor UPW loops, solar photovoltaic manufacturing, and pharmaceutical dosing, unpigmented virgin PVDF resins provide ultra-low Total Organic Carbon (TOC) and withstand continuous hot acids up to 140°C.

Fast & Energy-Efficient Actuation

Due to smooth thermoplastic ball surfaces, operating torques are remarkably low. Paired with compact IP67 electric actuators offering fast 7–12 second cycling, manual override, visual position beacon, and optional 4–20mA modulation.

1. How do I select the right plastic body material (UPVC vs. CPVC vs. PVDF vs. PPH)?

Selection depends primarily on operating temperature and chemical aggressiveness:

• UPVC: Most economical; ideal for general water treatment, dilute acids, and salts up to 60°C.

• CPVC: Retains higher mechanical strength up to 95°C; perfect for hot acid distribution and electroplating lines.

• PPH: Excellent resistance to non-oxidizing acids, solvents, and alkalis up to 100°C; welded piping systems.

• PVDF: High-end fluoropolymer rated to 140°C; essential for ultra-pure semiconductor water (zero leaching) and extreme oxidizers like wet chlorine and nitric acid.

2. How does DELCO prevent the plastic mounting top pad from cracking under motor torque?

Because thermoplastics have lower tensile shear strength than metals, high-torque electric actuators can induce fatigue cracking at the valve neck. DELCO addresses this by incorporating an engineered direct-mount ISO 5211 platform with metal threaded inserts molded directly into the neck ribbing. This distributes torsional and bending stresses uniformly, preventing plastic stress fractures during rapid motor start-stop cycles.

3. What is the difference between EPDM and FKM (Viton) O-ring elastomeric seals?

While the ball seat is always virgin PTFE, the internal backing O-rings must be chemically compatible with your fluid:

• EPDM Seals: Best for municipal water, caustic soda (sodium hydroxide), alcohols, and mild bleaching agents. Not compatible with oils or hydrocarbons.

• FKM (Viton) Seals: Superior resistance to concentrated inorganic acids, chlorine gas, hydrocarbons, and organic solvents. Essential for aggressive chemical dosing skids.

4. Can motorized plastic ball valves perform accurate 4–20mA proportional throttling?

Yes. Because plastic ball valves exhibit very low seat friction compared to metal valves, they operate with minimal hysteresis and zero stick-slip. When coupled with DELCO high-resolution modulating electric actuators (incorporating 4–20mA / 0–10V smart positioners and contactless digital encoders), they provide precise flow metering for acid/alkali neutralization and chemical feed lines.