Rehman Engineering Works Archives

Type: Ball valve (quarter-turn shut-off valve)
Load: Handles internal fluid pressure; not designed for mechanical load-bearing
Cage: Not applicable (solid ball with seats instead of cage structure)
Performance: Fast operation, low pressure drop, reliable sealing, long cycle life
Construction: Valve body + perforated ball + seats (PTFE or similar) + stem + handle/actuator
Use cases: Fluid shut-off in pipelines, hydraulic and pneumatic systems, water and oil control, industrial processing
Note: Best for on or off control; not ideal for precise flow regulation as partial opening can cause seat wear

Type: Rotodynamic pump (centrifugal type)
Load: Primarily hydraulic load from fluid movement; radial and axial forces on impeller
Cage: Not applicable (no rolling element cage; uses impeller and shaft system)
Performance: Steady flow, moderate to high efficiency, best for low-viscosity fluids
Construction: Casing, impeller, shaft, seals, bearings, and drive motor
Use cases: Water transfer, irrigation, HVAC systems, industrial fluid movement, cooling circuits
Note: Requires proper priming before operation; avoid dry running and ensure correct sizing for best efficiency

Type: Check valve (non-return valve)
Load: Handles fluid pressure loads in one direction; blocks reverse pressure
Cage: Internal guide or spring mechanism (varies by design such as spring-loaded or swing type)
Performance: Quick response, low backflow leakage, stable operation under varying pressures
Construction: Valve body, seat, disc/ball or poppet, optional spring mechanism, threaded or flanged ends
Use cases: Pumps, compressors, pipelines, hydraulic and pneumatic systems, water and fluid control setups
Note: Install in correct flow direction (marked on body); ensure compatibility with pressure, fluid type, and operating conditions

Type: Air-Operated Double Diaphragm (AODD) pump
Load: Handles fluid pressure loads; suitable for low to medium pressure transfer applications
Cage: Not applicable (uses flexible diaphragms instead of rolling elements)
Performance: Steady flow, self-priming, can run dry, handles solids and viscous fluids well
Construction: Dual diaphragm chambers, air valve system, check valves, and fluid housings (metal or plastic options)
Use cases: Chemical handling, slurry transfer, oil and fuel movement, wastewater, coatings, and industrial processing
Note: Requires clean, regulated compressed air; efficiency depends on air supply quality and proper diaphragm material selection

Type: Gate valve (rising stem or non-rising stem)
Load: Handles fluid pressure loads; not designed for mechanical side loads
Cage: Not applicable (no cage, uses gate/disc mechanism)
Performance: Low pressure drop when fully open; reliable sealing when closed; slower operation compared to other valves
Construction: Valve body + gate (disc) + stem + सीट (seat) + bonnet; typically cast or forged metal construction
Use cases: Pipeline isolation, water systems, oil and gas flow control, industrial shut-off applications
Note: Avoid using for throttling as partial opening can cause wear and vibration; operate in fully open or closed position for best performance

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