Teledyne LeCroy Test Services’ (TLTS) Quick Stem Sensor (QSS) is a patented device which is applied to a valve stem using a layer of adhesive. The one-piece QSS consists of strain gages wired in a Wheatstone bridge and is configured to measure thrust and torque simultaneously.
Teledyne LeCroy Test Services Quick Stem Sensor (QSS) offers an alternative means by which to measure thrust and torque on motor-operated and air-operated valves. The QSS is a pre-fabricated thrust and torque strain bridge that is applied to a shaft in much the same way as a strain gage.
This time-saving device was developed to reduce the time and effort required to install strain gages in a radioactive environment. Since its introduction in nuclear plants, the patented QSS has become popular in many other industries and applications where gaging time and cost is a concern.
Accuracy:
Applications:
We specialize in commercial-grade stem components designed to meet your exact needs. Whether you are dealing with torque, thrust, or both, we offer flexible configurations tailored to your specifications.
TLTS can supply custom QSSs for high temperature applications, large stem diameters and irregular shapes, such as our Square Quick Stem Sensor (SQSS) shown here.
All solutions are commercial grade with 350 Ohsm resistance and available in a wide range of stem diameters and circumferences.
The Thread Removal Tool is used for the in-situ removal of valve stem threads. This permits the installation of the TLTS Quick Stem Sensor (QSS) on a smooth stem area for direct, accurate measurement of stem torque and thrust. A procedure for use of the thread removal tool is supplied with each system.
Datasheet
Final surface preparation is accomplished with M-Prep Conditioner A immediately followed by M-Prep Neutralizer 5.
Conditioner A is a mild phosphoric-based acid compound. It acts as a mild etchant and accelerates the cleaning process. Neutralizer 5 is an ammonia-based material. It neutralizes any chemical reaction introduced by the Conditioner A which produces an optimum surface condition for the strain gage adhesive.
M-Bond 200 is used for temporary sensor installations. It is easy to handle and has a fast room temperature curing time.
Hardman Epoxy is a two part adhesive that can be used for temporary or permanent installations. This adhesive cures in 12 hours at ambient temperatures. Stem temperatures should not exceed 150° F.
EPY-500 is used for high temperature sensor installations (>200 to 450° F). It is a two-part epoxy that requires heat curing.
M-Coat C is a solvent thinned RTV silicone rubber that cures to a tough rubbery transparent film. The coating has good all-around mechanical and electrical properties and is completely non-corrosive. Film thickness 0.015-0.02 inches per coat, good water splash protection, and chemical resistance.
3145 RTV is a single component 98% solids RTV silicone rubber. It has a room temperature cure (humidity reactive), is completely non-corrosive, and forms tough rubbery coating. The coating has high strength toughness and high elongation capabilities. It is good for short-term water immersion and is resistant to many chemicals.
Ultra Black RTV is a single component, non-flowing RTV silicone. It has a room temperature cure (humidity reactive), is completely non-corrosive, and forms tough rubbery coating. The coating has high strength toughness and high elongation capabilities. It is good for short-term water immersion and is resistant to many chemicals.