840 Series

Control valves for general applications

The 840 series cage-guided valve is specially designed using recent advances in control valve technology. It is used to control a wide variety of relatively clean liquids and gases at high pressure differentials. Configured with either flow-to-open or flow to- close trims, the valve is well suited for steam, gas or liquids, where flow-to-close is typically used for liquid service, and flow-to open for steam and gas. The design of the 840H (drilled-hole-cage)valve is primarily used for severe service applications requiring anti-cavitation or low-noise trim. In most cases, high pressure drop in process conditions may cause erosion, noise or vibration, which can affect process control. The 840H is a good solution to this severe service application.

The 840 series valve is flexible, allowing a variety of trim types to be installed in the body. In addition, its cage-guided construction reduces plug vibration and provides stable performance throughout travel. All 840 trims have a quick change design to guarantee convenient repair and easy trim replacement.

• Multi-spring- Multi-spring design allows very low hysteresis and dead band.
• Proven trim design – Single P-port, multi-step, V-notch type cage.
• Fail mode – Fail-to-close on loss of air is standard. – Fail-to-open on loss of air is also available. – Diaphragm, piston, hydraulic and electric actuation available.
• Quick change trim – All internal parts can be inspected easily by removing bonnet and cage.
• Accessories – A full range are available to meet requirements.