Multi-Z valves are used if solids are entrained in the medium and if there is a possibility of cavitation forming. In addition this multiple stage valve is capable of reducing high-pressure differentials via a multiple stage relief process. Flowserve reduces pressure via division in partitions, a course which is different to that pursued by other suppliers. The major advantage is a noticeable reduction in wear combined with an extremely low-noise control valve. Likewise deviating from conventional procedures, in order to avoid cavitation a physically optimized technology has been implemented that achieves significantly better results.
Additional information
| Function | Cavitation Elimination |
|---|---|
| Pressure Stages | 3 to 6+ |
| Cv Range | 0.03 to 137 |
| Cavitation Sigma Limit | 1.002 |
| Trim Design | Axial Notched Plug & Seat Sleeve |
| Solids Capable | Yes |
| Materials | Alloy & Ceramics |
| Valve Size | 1" to 10" |
| Pressure Class Standard | ASME B16.34 |
| Pressure Class Range | Class 300, 600, 900, 1500, 2500 |
| Body | Globe, Angle |
| End Connections | Integral Flange, Screwed (NPT), Socket Weld, Butt Weld, Custom |
| Face-to-Face Standard | ANSI ISA S75.08.01, S75.08.06 (Globe); Manufacturer Standard (Angle) |
| Bonnet | Bolted with Extension as required by Pressure-Stages |
| Packing | Standard, Twin Seal, Vacuum Seal, Fugitive Emissions, Live-Loaded, Bellows |
| Guiding | Plug to Seating Sleeve along Pressure-Stages |
| Trim | Axial Notched Plug |
| Trim Characteristics | Equal Percentage, Linear |
| Seating | Metal-to-Metal & Soft |
| Shut-Off Classification | ANSI FCI 70-2 Class IV, V, VI |
Features & Benefits
- Multi-Z is specifically designed to handle high-pressure drops where entrained solids are a problem, and is tested and certified for pump compatibility
- Ideal for applications in chemical, petrochemical and power with pressure differentials of up to 5880 psi (400 bar), such as system start-up and boiler feed-water recirculation
- The addition of a unique venturi outlet nozzle provides further trim and seat protection from high velocity, cavitation and flashing
- Multi-Z linear multistage plug design provides high rangeability and throttling resolution, and dramatically reduces noise
- Trim designs are available as unbalanced or pressure-balanced, with the number of stages optimised for specific service conditions
- Multi-Z body is available in angle configurations, and in a choice of carbon steel, stainless steel, nickel-based alloy, and CrMo steel
Standards & Certifications
| Certifications | Canadian Registration Number (CRN) |
|---|---|
| Design Standards | ASME B16.5 – Pipe Flanges & Flanged Fittings |
| ASME B16.34 – Valve Flanged, Threaded, and Welding End | |
| ASME SA Materials | |
| ASTM A Materials | |
| Quality | IS0 9001:2008 |
| ATEX QAN | |
| IECEX QAR |
