The W68 and W88 valves are sanitary regulating valves designed for precise flow and pressure control in processing systems. The W68 is ideal for standard throttling applications, while the W88 provides enhanced control authority for higher-pressure or higher-flow systems. Both deliver smooth, accurate regulation where traditional shutoff valves are not suitable.
W68 & W88 Series Valves
W68 & W88 Series: Single Seat Valves
Throttling or regulating valves are designed for flow and pressure control applications. Fluid flows against the tapered curve of the valve seat allowing a calculated amount of flow through as it opens and closes. The throttling valve is typically equipped with a positioner. Throttling valves are used for flow control, pressure control, filler level control, and modulated filling.
Throttling & Regulating Valves
Key Features of W68 & W88 Series Valves
-
A modular family of "throttling or pressure control" valves that are the ultimate in: easy cleaning, high pressure, low maintenance design. With 11 standard bodies, 12 different actuators, 4 stem types, flush or standard adapter, and a wide range of control tops, the valves can be configured to precisely fit any application.
- Bodies machined from solid bar 316L with laser welded ports
- Stems available with low and high flow Cv values
- Seat ring inserts for very low Cv in 1" and 1½" (25mm and 38mm) bodies
- Adaptor and lower bearing carrier with inlet and discharge flush connections
- High pressure capability
- Seal options – Tri-Ring (FKM or EPDM for complete shut-off) or Metal Plug
- Open yoke 3-A design
- Reverse (R) or standard plug design
- Pneumatic and electropneumatic positioners available
Model Types:
-
The W68 and W88 Series include a wide range of single-seat valve configurations designed to support throttling, diverting, and regulating applications.
- W68 Series – Throttling
- W88 – Aseptic Stem Flush Throttling
- W682 or W882 – Divert Throttling
- W685 or w885 – Non-Slamming Divert Throttling
Configurations:
-
Pneumatic Moore positioners - Uses 3-15 psi (.20-1.03 bar) pneumatic control signal and plant air supply to drive the seat plug into a certain position.
- Direct acting (as input increases, supply air increase)
- Reverse acting (as input increases, supply air decreases)
- Cost effective way to control the valve
-
Electropneumatic Bürkert positioners - Uses a 4-20mA electronic feedback signal between the valve stem sensor and a solenoid in the control top which adds or vents air into the actuator to move the plug seat up or down depending on the desired position.
- Positioner attaches right to the valve
- Includes all of the controlling functions within the unit
- Long service life
- Also available with bus communication (DeviceNet, Profibus) and additional control options
We’re Here to Help
Get personalized support for equipment selection, sizing, and applications.
Theory of Operation: Single Seat Valves
Single seat valves from SPX Flow (Waukesha Cherry-Burrell) operate by using a pneumatic (or manual) actuator to move a valve stem and plug on and off a single seat, creating a tight shutoff when closed and a full-bore flow path when open for efficient product transfer and CIP circulation.
In shut-off/divert/tank outlet service (W60), the valve simply opens or closes to stop flow or direct it through the desired line.
For throttling/regulating service (W68/W88), a tapered stem/seat geometry and typically a positioner allow controlled, repeatable modulation of flow, pressure, or level.
For aseptic applications (W80), a stem flush adapter adds a liquid or steam barrier around the stem to help protect the product zone while minimizing crevices near the seal area.
For over-pressure protection (WR60/WR80), the valve functions as a relief device that “cracks” open at an adjustable set pressure to protect pumps and piping, and can be fully opened for CIP without over-pressurizing the system.
W68 & W88 Single Seat Valve Overview
This video provides an overview of the SPX Flow W60 single seat valve, highlighting its design, operation, and hygienic performance. Learn how the W60 supports reliable shutoff, divert, and tank outlet applications in sanitary processing systems.
Tools & Resources
Frequently Asked Questions
A regulating valve—such as the W68 or W88—modulates flow by partially opening or closing the valve seat to maintain a desired flow rate, backpressure, or line pressure. Unlike simple shutoff valves, regulating valves continuously adjust to process conditions, making them essential for applications requiring stable flow control, product consistency, or pressure regulation within sanitary processing systems.
