Quick Advance QA Series
Description
Piston Type Sampling Valves are widely employed in the sampling of thick slurries and viscous materials because their design provides little to no dead space within the valve and vessel or line connection. The piston completely fills the valve and connection bores and provides a self-cleaning (self-pigging) action during the closing stroke of the valve. The common design of this type of valve also utilizes a very long stroke to completely withdraw the piston from the media flow.
Typical designs for a manually operated piston type valve used for draining or sampling liquids utilize a hand wheel attached to a threaded stem which in turn is connected to the piston. The stem typically turns in a fixed threaded bushing that is generally found in the yoke (or bonnet) or the piston itself. Rotary motion of the hand wheel causes a linear movement of the piston.
Although the effort used to draw a sample using a piston type valve is greater than using a ball valve, the advantages quickly outweigh any of the disadvantages. For instance, ball valves are operated with a quarter-turn. A ball valve allows material to accumulate around the ball which prevents a representative sample from being drawn unless the valve is first properly purged.
Strahman’s new Quick Advance Sampling Valves offer all of the features typically found in piston type sampling valves with the convenience of a quick open/close feature of a ball valve. The QA series uses a rack and gear combination to maintain the linear motion of the piston and provides the valve with a full piston design while traveling just 1/3 turn. This results in less time and labor required to collect a true, representative sample.
All QA Series Valves feature a safety stop detent that prevents the valve from opening under process pressure. The QA-700 is rated to ANSI Class 300 and is available in the same materials as Strahman’s standard Sampling Valve line. The new QA Series is available with standard packing rings and zero or two inch piston extensions. Conversion kits for existing valves are also available.
A Strahman Sampling Valve provides users with safe, effective, and consistent product sample extractions from the pipeline under high pressure or high vacuum conditions without fear of contamination or internal blockage. Strahman Piston-Type Sample Valves comply with the Pressure Equipment Directive (PED) No. 97/23/EC under SEP. Strahman Drain Valves 3” NB through 12” NB ANSI classes 150, 300, and 600 and 2” NB ANSI classes 300 and 600 comply under Category II liquid service.
Please note that the above product image is representative of products in this series and while we try to be as accurate as possible, the product you receive may slightly differ depending on valve size. Please refer to data sheets for dimensions and technical drawings, if applicable.
At Strahman, we pride ourselves on serving a wide variety of industries and process applications. We understand that each application is unique, and we are committed to providing custom designs to fit your specific needs. Your satisfaction is our priority. Please CONTACT US. We would be delighted to work with you on custom-engineered solutions that meet your exact requirements.