The Smith Meter Model 200-50B is a hydraulically operated, diaphragm-actuated, globe-pattern automatic pressure reducing control valve that holds a steady downstream pressure regardless of upstream fluctuations. A normally-open 50B pilot in the downstream side of the pilot loop senses outlet pressure through an integral sense line; as downstream pressure approaches the setting the pilot restricts the cover vent path and the main valve throttles. It is a modulating valve for most non-dead-end systems where downstream equipment needs protection from excessive pump pressure. Control range is limited to flow rates above 2% of nominal maximum flow.
Key specifications
Sizes / nominal flow: 2" 130 USGPM (492 L/min), Cv 50; 3" 420 USGPM (1,600 L/min), Cv 133; 4" 600 USGPM (2,250 L/min), Cv 204; 6" 1,000 USGPM (3,750 L/min), Cv 436
Pressure rating: Class 150 ANSI, 285 psi (19.6 bar); Class 300 ANSI, 300 psi (20.7 bar); derate per ASME B16.5
Maximum viscosity: 200 SSU (40 mPa·s); above that consult factory
Seals / temperature: Buna-N valve diaphragm with Viton pilot: 0 to 160 °F; Viton throughout: 10 to 350 °F
Materials: Carbon steel Model 200 body (stainless, carbon steel, ductile iron internals); 09SC strainer, Model 13 needle valve and 50B pilot in carbon steel
Weight: 2" 48 lb (22 kg); 3" 85 lb (39 kg); 4" 138 lb (63 kg); 6" 260 lb (118 kg)
Add-on functions: Solenoid block (30A), rapid shutdown (30B), maximum rate of flow (40A), back pressure (60A), check and thermal relief (80B/07)
Ordering information
The bulletin has no position-by-position model code. Per its ordering section, specify:
Valve size (2", 3", 4" or 6") and flange class
Liquid name and specific gravity or API gravity
Temperature range and viscosity range (minimum, normal, maximum)
Maximum working pressure and the pressure setting(s) required
Seals: Buna-N or Viton; any additional pilot functions
Bulletin notes: the bulletin title reads "Pressure-Limiting Valve" while the text describes a pressure reducing valve; the pressure-drop formula beside the flow table is garbled in the PDF (it is the usual Cv relation using specific gravity and flow); The dimension table prints the 2" pilot-envelope dimension D as 7.5 in (140 mm); 7.5 in is about 191 mm. For a lower-pressure-drop reducing valve see the 200-64A.
Pricing and lead time are quoted per configuration. Send the model code (or the details above) with your product and operating conditions to Flow Measurement Services for a quote. Specifications summarized from Smith Meter bulletin SS03015 Rev 0.4 (8/17); confirm current data with the factory before ordering.
Smith Meter (formerly FMC Technologies / TechnipFMC Measurement Solutions), now manufactured by Guidant. Flow Measurement Services supplies and services Smith Meter equipment.