Full PTFE / PFA Lining

3mm (1/8") thick pure virgin PTFE or PFA encapsulated disc provides complete chemical resistance — isolating the metal body from aggressive media including acids, alkalis and solvents.

Curvature Machined Seat

Precision curvature machined PTFE or PFA body seat ensures consistent sealing across the full disc travel — providing long-term bubble tight shutoff without seat deformation.

Elastic Seat Energizer

Silicone seat energizer maintains constant contact pressure around the full seat perimeter — compensating for temperature cycling and ensuring consistent sealing performance over service life.

Extended Neck Design

Extended neck allows for piping insulation around the valve body and provides clear access for actuator mounting — compatible with pneumatic, electric, hydraulic and gear box operators.

Two-Piece Epoxy Coated Body

Two-piece body with epoxy coating meets full ASME Class 150 and DIN 3840 pressure ratings for hydrostatic requirements — suitable for buried or corrosive environment installation.

Disc Spring Shaft Protection

Integrated disc spring ensures perfect sealing at the shaft penetration and protects the shaft from process media contact — extending shaft service life in aggressive chemical duty.

Top Stem Bushing Alignment

PTFE top stem bushing ensures precision alignment between upper and lower shaft — eliminating shaft wobble, reducing operating torque and preventing seat wear from disc misalignment.

Multiple Flange Standards

Available in ANSI 150LB, PN10, PN16, JIS 10K, JIS 16K and AS Table E flange drilling — covering all major international piping standards without modification.

Wide Body Material Options

Ductile Iron A536, Carbon Steel WCB and Stainless Steel CF8M body options — shaft in SS431 or SS630 — covering standard, corrosive and hygienic process requirements.

ISO 5211 Actuator Interface

ISO 5211 mounting flange on all models allows direct actuator mounting without bracket adapters — compatible with all standard pneumatic, electric and hydraulic actuator configurations.

Broad Application Range

Suitable for chemical and petrochemical, water and wastewater, food processing, mining, textile, desalination, HVAC, shipbuilding and power generation service.

Wafer, Lugged & Flanged

Three end connection options — wafer (VF-750) for standard inline service, lugged (VF-753) for dead-end service, and flanged (VF-757) for high-integrity bolted connections.