Yibengfa D341X-16Q Turbine Butterfly Valve: Pressure-Temperature Parameters and Installation Guide
In the model code, D denotes butterfly valve, 3 indicates worm gear drive, 4 signifies flanged connection, 1 represents the centerline (concentric) structure, X indicates a rubber seat, 16 is the nominal pressure rating of PN16, and Q denotes a ductile iron QT450 body. It is widely used for flow isolation and regulation in water supply, drainage, HVAC, chemical, and power systems.The main Butterfly Valve product names of China Butterfly Valve Network include:Groove Butterfly Valve,Hydraulic Control Butterfly Valve,Hydraulic Control Check Butterfly Valve,High Temperature Butterfly Valve,JIS Three Eccentric Hard-sealed Flange, Wafer Butterfly Valve,Lug Butterfly Valve,Manual Metal Hard-sealed Wafer Butterfly Valve,Manual Soft-sealed Wafer Butterfly Valve,Manual Single Eccentric Wafer Butterfly Valve,Manual Ventilation Butterfly Valve.
Pressure and Temperature Parameters
The nominal pressure is PN16 (1.6 MPa). The shell (strength) test pressure is 2.4 MPa, and the seal test pressure is 1.76 MPa. The standard applicable temperature is up to 80 degrees Celsius with an EPDM seat, extendable to 120 degrees Celsius depending on the seat elastomer selected. The valve body is QT450-10 ductile iron, the disc is ductile iron encapsulated in EPDM or NBR rubber, and the stem is 2Cr13 or 304 stainless steel. The design is a bidirectional soft seal, meaning the valve holds tight in either flow direction, though the preferred flow direction is indicated by the arrow on the body for optimal seat life.
Core Design Features
The worm gear actuator provides speed reduction and torque multiplication, allowing a single operator to turn the 90-degree stroke with modest effort. The centerline disc geometry produces a low flow resistance coefficient and a flow characteristic that approaches linear, with no cavity where debris can accumulate. The flanged ends conform to GB/T 9113 or EN 1092-1, and the face-to-face length follows GB/T 12221.
Installation Procedure
Pre-installation checks. Verify the nameplate matches the pipeline requirements: diameter, pressure class, body material, and seat elastomer. Flush the pipeline to remove weld slag, rust, and sand before valve installation, as debris will damage the rubber seat.
Flange alignment and gasket. The two pipe flanges must be parallel and concentric, with a misalignment not exceeding 1.5 per thousand of the flange outside diameter. Do not add an extra rubber gasket between the flanges, because the valve seat itself is the sealing element; use a 3 mm asbestos-free gasket for clean water, or a spiral-wound gasket for hot water and steam.
Bolt tightening. Tighten the flange bolts in a diagonal, crisscross pattern in three stages: 30 percent, 60 percent, and 100 percent of the specified torque. Single-side tightening deforms the body and causes seat leakage.
Orientation. Install the valve with the disc in a 10 to 20 percent open position to avoid scoring the seat during insertion. Mount the worm gear housing upward or to the side, never downward, to prevent water accumulation in the gearbox.
Post-installation commissioning. Cycle the handwheel from fully closed to fully open several times. The operation should feel smooth without binding. After closing, turn the handwheel an additional one-eighth turn only; over-tightening will crush the rubber seat. Pressurize the line and check the flange joints and stem packing for leakage.
Summary
The D341X-16Q combines a PN16 pressure rating, a temperature ceiling of 80 to 120 degrees Celsius, and a QT450 ductile iron body with EPDM sealing for reliable bidirectional shutoff in water and neutral media. Correct installation depends on clean piping, parallel flanges, staged cross-pattern bolt tightening, and avoiding over-closure of the seat. Following these parameters and procedures ensures dependable service life in low-pressure water and drainage pipelines.
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