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Check out our newest case history:

Check out our newest case history:  How Cla-Val's 210-FF Altitude Control Valve with KO Anti-Cavitation Trim met the challenge of cavitation during the tank filling process.  Click here to read and see for yourself.

Choosing the Right Fueling Nozzle
The ability to efficiently refuel aircraft is one of the most important functions in successfully operating a commercial airport or military air base. That capability, coupled with the proficiency of flight line personnel, is largely dependent on the quality of the fuelling equipment that is being used. The performance and reliability of this equipment not only impacts on-time departures, it also has a significant influence on the safety of passengers, personnel, aircraft and support facilities.

Cla-Val's Modulating Level Control Valve with Flow Metering provides the Virginia town of Front Royal with an all-in-one solution for their water treatment plant expansion
Multi-Tasking Level Control: Cla-Val?s Modulating Level Control Valve with Flow Metering provides the Virginia town of Front Royal with an all-in-one solution for their water treatment plant expansion

Cla-Val Electronic Pressure Management Valves give a Toronto neighborhood a winter free from pipe breaks
No Winter Break(s): Cla-Val Electronic Pressure Management results in a break free winter in an East York-Toronto Pilot Project

Cla-Val Blending Valve Provides a Cost Effective Way to Meet the New Arsenic Rule Requirements for Drinking Water
Just in the Nick of Time: Cla-Val Blending Valve Provides a Cost Effective Way to Meet the New Arsenic Rule Requirements for Drinking Water

High Tech Solutions for a Low Tech Problem
The San Sevaine turnout is just one of many places in the Inland Empire Utility Agency’s waterworks system where a standard automatic control valve is just not the best product choice for its flow control requirements.

Cla-Val New Pipeline Surgeview Analysis Valve News
One of the most complex challenges a design engineer faces in dealing with pipeline surges is to determine the best way to provide proper protection. Whenever there is a change in pipeline velocity, a potential surge problem can develop. Pipeline surge problems can be caused by many events including, but not limited to, the following.

Wireless Level Valve Control for Hydroelectric Generating Stations
"Everyday we had to twice drive up the hill to the fore bay to read the level and return to the hydro site to reposition the Cla-Val. Now it is automated."

Cla-Val Metering Valve Controller with Built-in Totalizer
Water districts are faced with ever increasing demands to account for their water usage. To monitor this information they must add flow meters and totalizing instruments. In some cases the flow or total volume may need to be controlled with an automatic control valve. Doing all of this typically requires several instruments. What is needed is an instrument that is capable of doing it all.

Cla-Val E-Solutions Actuated Pilot Control
For many years Cla-Val 90-21 UL listed pressure reducing valves were listed in ductile iron 150# flanged (rated to 175 psi) and 300# flanged cast steel (rated to 300 psi). The existing valves are still available but NOW the ductile iron valve is listed with 300# flanges (rated to 300 psi). In addition the Model 90-21 is NOW listed with grooved ends (rated to 300 psi) globe pattern sizes 1 1/2” - 6” and angle pattern sized 2” - 4”. The NEW grooved end design allows easier installation therefore cost are reduced.

Look What's New from Cla-Val Fire Products Division
For many years Cla-Val 90-21 UL listed pressure reducing valves were listed in ductile iron 150# flanged (rated to 175 psi) and 300# flanged cast steel (rated to 300 psi). The existing valves are still available but NOW the ductile iron valve is listed with 300# flanges (rated to 300 psi). In addition the Model 90-21 is NOW listed with grooved ends (rated to 300 psi) globe pattern sizes 1 1/2” - 6” and angle pattern sized 2” - 4”. The NEW grooved end design allows easier installation therefore cost are reduced.

Simplifying SCADA System Integration by getting it right the first time!
Accurate level control of storage tanks and reservoirs is vital. Level control valves tasked with this responsibility must also provide adequate water turnover and not upset the distribution system in the process of maintaining these levels. Hydraulic altitude valves, utilizing simple on/off control, have been performing this service since their inception in the 1940’s. Moreover, they can be equipped to maintain a fixed system backpressure or flow rate for system protection when applicable. Delaying the opening of the valve to a preset reservoir low level is also an option. The electronic equivalent of the hydraulic altitude valve is appropriate for applications that require changeable system variables such as backpressure, flow, and valve position or level. It utilizes the same main valve but has a different pilot system and method of control. The control system uses a Cla-Val 131VC-1 series controller, which supervises the main valve. The controller typically gets a remote set point from the SCADA system by way of an RTU. Shown below is but one strategy for remote level control. This particular one does not require the hydraulic altitude pilot system, although it may be used for backup control. It also provides better accuracy and less hassle if delayed opening on lowering reservoir level is required. The level shut off and reopening points are entered into the controller using actual engineering units rather than the trial and error method required for hydraulic versions. The 131 series control valve has two inputs available (PV1 & PV2). PV2 accepts the level transmitter signal for level control and PV1 the flow transmitter, which is used to control the flow rate into the reservoir. The diagram below illustrates the setup of the control system. The High Level shutoff and Delayed Opening band (in feet) are programmed into the controller. Then the flow range is programmed with either a local set point or a remote set point from a SCADA RTU, such as the Cla-Val VSU-1 Valve Station RTU. As level rises in the tank, the valve is open and under the control of the set point. When the level rises to the High Level, the valve closes. As the level falls the valve remains closed until it drops the amount of programmed Delayed Opening to the Low Level point, at which time the valve reopens with rate of flow control again.

Positioning versus Direct Flow Control Valves...which do you choose?
"After the contractor finished with the electronic flow control we’re not satisfied with the valves performance." Curious about the setup, I asked the water district operator where the flow meter signal went. "The PLC" he replied. And what is the feedback signal to the Cla-Val 131VC-1 controller? "The position transmitter".

Cla-Val ECO-Timer Flush Valve
Clean water, we all expect it from our taps.Water districts go to enormous lengths to ensure that they meet all drinking standards at the source. However, once it is introduced into the water distribution system, water treatment levels can begin to degrade and protection diminishes. Most of the time, this is not a problem, but in distant parts of the distribution system, there may be dead end pipes with low demand. During low flow periods, the chlorine level may drop to dangerous levels. Flushing crews can periodically eliminate this "dead end water", however, this is wasteful and expensive. What is needed is a way to automatically get rid of this "dead end water".

Cla-Val Electronic Valve Control Demo-labs
Water districts are making important decisions regarding the remote electronic control of valve stations and their integration into SCADA systems. They must be comfortable that the right decisions are being made – and what better way to do this than to see practical demonstrations of the latest control methods before the investment is made!

Electronic Flow Control with Orifice Plate Flow Meters
"I need help starting up this 131VC-1 flow controller. The contractor is anxious to finish this project." I asked the sales agent what was the flowmeter. "It’s a Cla-Val X52A orifice with DP sensor" was the reply.

Cla-Val Approvals
Cla-Val products are designed and manufactured in accordance with applicable Waterworks, Fire Protection, Aviation Ground Fueling and Marine industry standards and governmental regulations.

Cla-Val Remote Control Filter Valves
For many years Cla-Val has supplied the ultimate solution for the automatic control of pressure filter systems. Our Hytrol valves control the various filter processes day in and day out with precision and reliability. Right from the raw water inlet to the finished product Cla-Val has it all under control. Conventional filter control using standard butterfly valves present many draw backs that can be over come using Cla-Val Hytrols (single chambered) and Powertrol (double chambered) automatic valves. First of which is the tremendous cost of the butterfly valve and the actuator. Diaphragm activated valves are much more economical for the same application saving thousands of dollars in valve costs on each project. Second our valves use the line pressure to open and close. The Butterfly valve requires a motor operator to overcome the line pressure. Higher power consumption demands add to the electrical system (transformers & wiring etc) and increases the overall operating cost of the system. Our valves only require a 6 watt 3-way solenoid for proper operation. In addition the motor operator prevents easy access to the rest of the filter system piping.

Cla-Val Water Pressure Balance Solution
Travis County Water District 17 is located 20 miles west of downtown Austin, Texas. The service area is approximately 14,000 acres and includes the cities of Austin, Lakeway and Bee Caves. Part of the district also includes Steiner Ranch, a rapidly growing community closely located to many of Austin’s high tech industries. In 1994 the district installed a Cla-Val 136 series solenoid control valve at Cloudy Ridge Street. The purpose of the valve was to separate two pressure zones and open to fill ground storage tanks in a lower zone. Whenever the valve was opened the upper zone pressure often dropped excessively, causing problems in the upper zone.

Cla-Val Surge Control
Surge Control Valves protect pumps and distribution systems from pressure waves caused by rapid changes in pipeline velocity. The gradual starting and stopping of pumps can’t generate harmful surges. However a power failure causes dangerous surges in the system which can damage equipment. Thus the control of surges in pumping systems is extremely important. The picture at left shows a typical installation. The surge control or surge anticipator valve is sized to protect the system by discharging to atmosphere. Usually a valve is selected that is one-third the line size or has the capacity to relieve one-third of the total pump output. Today’s computer system models provide a much more detailed picture of pressure transients caused by a power failure. The following illustrations show graphically what the surge anticipator valve does when a power failure occurs.

Cla-Val Water Treatment Plant Solutions
Since the introduction of Cla-Val’s Metering and Flow control valve, Dan Esser, Cla-Val Eastern Region District Manager has found many varied applications to apply this technology. Some of these applications involved replacement of pump control valves, altitude valves and pressure reducing valves. One of the newest applications utilizes the 133 series valve as a filter plant effluent flow metering and flow control valve.

Cla-Val VSU E-Solutions
Cla-Val announces the VSU Series remote terminal units specifically designed to bring valve station information into the office.

Cla-Val E-Solutions
This is the first in a regular series of bulletins devoted to the use of electronic valve controls and their integration into modern SCADA systems. Cla-Val is well recognized as a leader in pilot controlled hydraulically operated control valves for water, fuel, and many other fluid control applications. However, as water utilities and other industries install and modernize their systems, figuring out how to "talk to" or communicate to the valves presents unique opportunities and challenges. Cla-Val has responded to these challenges by offering numerous economical alternatives to best suit the applications, from retrofitting existing installations to new applications.