Single Stage Anti-Cavitation Trim
ST-1 trim is a cost-effective single-stage trim that minimizes cavitation damage to valve and piping by diverting the location and controlling the concentration of imploding vapor bubbles to an area away from metal parts. The ST-1 trim works with diametrically opposed drilled, stepped holes that force vapor jets to impinge on each other in a column at the center of the cage rather than erode the valve body or trim.
As with all other Trimteck-Optimux® control valves and products, ST-1 trim is designed with maintenance, reliability, performance, and high interchangeability of parts in mind.
Multi-Stage Anti-Cavitation Trim
ST-2 Multi-Stage trim not only eliminates cavitation damage, but it often prevents cavitation from occurring altogether. By reducing pressure through a series of restrictive channels and expansion areas, it prevents vapor bubbles from forming and minimizes hydrodynamic noise. The ST-2 Multi-Stage cartridge consists of concentric cylinders of drilled holes and grooved channels; the expansion and contraction of the fluid from channels through holes and back into channels create a series of pressure drops that eliminate cavitation in most applications, and reduces cavitation damage others.
Noise Attenuation Trim
ST-3 Noise Attenuation trim works to reduce control valve noise in a broad spectrum of gas applications. ST-3 trim has two variants: the first is a one or two-stage design that reduces noise levels up to 15 dBA, the second is a multi-stage design for more extreme noise reduction up to 30 dBA. ST-3 works by controlling both pressure and velocity of the gas through the valve, thereby reducing turbulence, which is the culprit of all aerodynamic control valve noise. Multi-stage ST-3 reduces pressure with a concentric cylinder design similar to the ST-2 anti cavitation trim.
Trimteck® ST-3D & ST-3P
Downstream Devices for Noise Attenuation
When ST-3 or ST-4 in-valve noise attenuation trim is insufficient to reduce noise to acceptable levels, Trimteck offers economical downstream devices for additional attenuation: ST-3D Diffusers and ST-3P Diffuser Plates, both capable of noise reductions of up to 25dBA. For more extreme reductions, Trimteck also offers in-line silencers with the capacity to reduce noise levels by more than 30dBA.
Any of these solutions can be used in series with Trimteck’s Optimux OpGL Globe Control Valves fitted with ST-3 or ST-4 noise abatement trims to cost-effectively reduce noise levels and provide backpressure in many applications.
Stacked Disc Anti-Cavitation & Noise Abatement Trim
ST-4 Stacked Disc trim is a powerful solution designed to tackle the most severe pressure drops while reducing sound levels and eliminating the effects of cavitation. It can be used in liquid, gas, or multi-phase service. The ST-4 design consists of individual discs machined with progressively deeper concentric grooves machined and stacked to create a compact cylinder. The cylinder is then clamped into the body cavity of an OpGL globe valve and doubles as a seat retainer. Flow in this case is under the plug and as the fluid travels from the interior of the cylinder through the jagged grooves it is forced to make a series of 45o dives and ascents. Simultaneously the space between the grooves grows as you move from the center of the cylinder outward, allowing for expansion and thus reducing pressure in stages.
Venturi Seat Ring for Flashing Service
No matter how many pressure stages are introduced into a valve, in flashing service the pressure drop will result in the liquid flashing from liquid form to a gaseous form – carrying with it erosive water droplets at high velocity. Therefore, if flashing is present in a service, then the damaging effects must be controlled by displacing the erosion to non-critical components in the system. One way to do this is with a CVD-5B hardened ST-5 Venturi Seat.
Trimteck® is at the forefront of applying innovations in material science to extend the life of its process control equipment. First used in the aerospace industry to harden rocket nozzles on the space shuttle, CVD-5B is a chemical vapor diffusion process using boron wherein a hard wear-resistant metal mesh is fused into the surface of a wide variety of ferrous and non-ferrous materials.
Unlike coatings, during the CVD-5B process, superheated boron atoms are diffused deep into a host surface to form a metal boride layer that permeates evenly up to .015’’. Trimteck has harnessed and perfected this advanced technology to, in many cases, effectively extend the life of our valves more than 10 fold.
Metal Bellow Seal
In addition to a variety of effective fugitive emissions packing configurations, including: live-loading and special materials, Trimteck offers its unique Guard Master™ Metal Bellow Seal on the Optimux OpGL Globe Control Valve to ensure compliance with stringent environmental and safety regulations.