SV Type SS316L Mixing Element

Product Overview

The SV type SS316L mixing element is the high-precision corrugated-plate replacement cartridge for the SV family. The element consists of 4-8 pressed metal plates, each 0.5-1.0 mm thick, stacked inside a cylindrical shell with each plate rotated 90° to the next. The corrugation pitch is 5-15 mm and the depth is 1.5-4 mm, chosen to keep the Reynolds number inside the plate channels within the target mixing regime. The element delivers the characteristic 1-2 μm dispersion precision of the SV family — the finest of any ywmixing element — and is used wherever the process requires σX ≤ 1-5% in a compact footprint.

Material Properties

SS316L for the SV element is supplied as cold-rolled sheet to ASTM A240, with the same UNS S31603 specification as the SK and SX elements. The plate thickness is 0.5-1.0 mm depending on the element size, which is at the lower limit of what can be pressed without cracking — the press tool is designed with a 5 mm corner radius and a single-draw die to keep the strain below the 40% elongation limit. The plates are then stress-relieved at 1050°C for 30 minutes in a vacuum furnace to remove the spring-back that would otherwise distort the corrugation geometry. Surface finish is 2B as standard, with optional electropolish to Ra ≤ 0.8 μm for pharmaceutical service.

Compatible Housings

The SS316L SV element fits the ywmixing SV type housing in DN20-DN200, with flanged (ANSI B16.5 Class 150, DIN PN16, JIS 10K) or tri-clamp (ISO 2852) end connections. The housing interior finish matches the element finish (2B or Ra ≤ 0.8 μm). End retention is by a corrugated-plate carrier ring that locks the plate stack into the housing bore. The element is supplied as a single welded cartridge with 4, 6, or 8 plates depending on the required L/D ratio.

Installation & Replacement Guide

Replacement procedure is similar to the SK element. Depressurize, drain, and remove the end retainer. Pull the element out axially with steady hand pressure, taking care not to bend the outer plate edges. Inspect the housing for fouling; SV elements are used in clean service so fouling should be minimal, but the inspection is still mandatory. Fit new EPDM or FKM gaskets, slide the new element in (the upstream end is marked with a red dot), and refit the retainer. Total replacement time is 20-30 minutes in the field.

Technical Specifications

Parameter	Value
Material	SS316L (UNS S31603) sheet, ASTM A240, 2B finish, optional electropolish Ra ≤ 0.8 μm
Element Geometry	Corrugated plates, 0.5-1.0 mm thick, 4-8 plates per element, 90° cross-rotation
Plate Dimensions	Length 100-600 mm; corrugation pitch 5-15 mm; depth 1.5-4 mm
Pipe Diameter Range	DN20 to DN200
Pressure Rating	PN16 standard; PN25 available
Temperature Range	-50°C to +300°C
Viscosity Range	0.5 cP to 100 cP (kinematic)
Dispersion Precision	1-2 μm (turbulent regime) / 3-5 μm (laminar)
Pressure Drop	ΔP = 0.1-0.5 bar across 8 plates at 2 m/s
Non-Uniformity Coefficient	σX ≤ 1-5% at L/D = 5-12, 4-8 plates
Clogging Risk	High — channel width 2-5 mm; particulate must be < 0.5 mm
Connection Types	Flange (ANSI 150, DIN PN16), tri-clamp (ISO 2852)
Mass (DN100, L/D=7)	0.9 kg per element

Applications

The SS316L SV element is the standard replacement for high-precision low-viscosity service. Municipal water-treatment plants use the element for coagulant and flocculant dosing (polyaluminum chloride at 5-15 mg/L, polyacrylamide at 0.1-1.0 mg/L) at DN50-DN200, achieving > 95% distribution uniformity that translates to a 15-25% reduction in polymer consumption. Nitric acid plants use the element for ammonia/air blending upstream of the converter gauze, achieving σX ≤ 0.5% at the converter inlet. Other typical services include oil-in-water emulsification (cutting fluids, metalworking coolants at 1-3 μm droplet size), continuous pH adjustment in industrial wastewater, and NOx flue-gas treatment in SCR systems.