Inox-val 2 Piece Ball Valves - 709 Series | Valpres

Valpres Series 709 Ball Valve

Two-piece ball valve for welded-end installation, available with Socket Weld or Butt Weld connections. The Series 709 is used on small-bore, high-pressure lines where threaded joints are not preferred due to leakage risk, vibration, thermal cycling, or plant specification requirements.

Technical Data

• Sizes: 1/4” to 2”
• Pressure rating: PN138
• Class 1500 available on request
• Temperature range: -20°C to +160°C
• Vacuum service: down to 10⁻³ torr
• Body materials: ASTM A479 316/316L stainless steel or ASTM A105 carbon steel
• Ball: ASTM A479 316/316L
• Antistatic stem: ASTM A479 316/316L
• Seats and seals: PTFE with carbographite
• End connections: BW or SW

Standards and Certification

Fire-safe execution is available in accordance with ISO 10497:2010. Material selection should be checked against the line class, corrosion allowance, fluid compatibility, and site certification requirements.

Typical Applications

• Steam and condensate branch lines within the stated temperature range
• Fuel gas, fuel oil, and auxiliary hydrocarbon services
• Process gas isolation on small-bore high-pressure pipework
• Utility systems requiring welded joints instead of threaded connections
• Vacuum or low-leakage isolation duties compatible with PTFE-carbographite seats

Suitable Media

The valve is suitable for fluids compatible with ASTM A105 or 316/316L body materials and PTFE-carbographite sealing components. Final selection should consider pressure, temperature, corrosion, phase changes, solids content, and cleaning procedures.

Variant Selection

• Socket Weld: commonly used on small-bore piping where alignment and field welding access are acceptable.
• Butt Weld: preferred where full-penetration welds, inspection requirements, or plant piping classes specify BW ends.
• A105 body: typical for carbon steel systems with compatible non-corrosive media.
• 316/316L body: used where corrosion resistance or stainless piping compatibility is required.

Actuation and Operation

The valve is typically supplied for manual quarter-turn operation. Pneumatic or electric actuation can be considered where stem torque, mounting arrangement, duty cycle, and fail-position requirements are verified for the specific valve size and service conditions.

Selection Criteria

Series 709 is selected when a welded connection is required and higher mechanical integrity is needed compared with standard PN64 threaded ball valves. Check SW/BW end type, pressure class, temperature, seat compatibility, fire-safe requirement, and maintenance access before specification.

FAQ

When should SW or BW ends be selected?
Use SW for compact small-bore welded installation; use BW where piping specifications require butt welds or weld inspection continuity.

Is it suitable for steam?
Yes, within the stated pressure-temperature limits and provided the seat material is acceptable for the operating steam conditions.

Can it replace a threaded ball valve?
Yes, when the line class permits welded valves and reduced threaded-joint leakage risk is required.