BRIEF DESCRIPTIONS
Vital to the safe and efficient operation of a power plant, the NV963/663Y Series Steam Pressure Reducing Valve has been designed for ultimate reliability. It employs many new technologies with advanced procession method to ensure the best performance for high pressure and temperature service.
FEATURES
Steam Pressure Reducing Valve consists of two parts: main valve and pilot valve. The main valve is mainly composed of valve seat, main valve disc, piston, spring and other parts. The pilot valve is mainly composed of valve seat, valve disc, diaphragm, spring, adjusting spring and other parts. The outlet pressure is set by adjusting the regulating spring pressure, and the diaphragm is used to sense the change of outlet pressure, and the piston is driven to adjust the size of the overflow area of the throttling part of the main valve through the opening and closing of the pilot valve to realize the function of pressure reduction and stabilization.
 | BRIEF DESIGN Available sizes: DN80(3") up to DN250(10") Available rating: PN100 up to PN420, Class 600# –2500# Flow Characteristics: Linear, Equal Percentage Leakage Level: ANSI B16.104 CL IV Rangeability: 50:1 Temperature Range: -20~570 DegreeC Connection: Flange, Butt Weld MATERIAL - Body: 1.0460 / SA-105 1.7335 / SA-182 F11 1.7383 / SA-182 F91 Other materials - upon request |
Forged Full Machined Body Design To adapt to the high pressure and temperature conditions, the LV963/663Y PRV uses forged material for body construction. Compare with casting body, forged full body has better mechanical property and strength endurance, able to handle thermal fatigue critical for reliable service, and ensure the safe, trouble-free performance during the continuous operation. | |
Very Tight shut-off The valve energized pilot balanced plug provides zero cc/min. leak rates, without penalty of huge actuators, even with metal to metal seats at full body pressure/temperature ratings, greatly increasing the valve's reliability. | |
Multihole Cage Design The multihole cage guided trim is capable of managing large pressure drops and reduces the negative effects of erosion, cavitation, and noise. With the different working condition, the cage can be custom-designed with flow characteristic including equal-percentage and linear to obtain the highest accuracy of desired steam pressure. | |
Pilot Plug Design Pilot plug design means that in the closed position, the main plug within the valve is unbalanced with full steam pressure acting on top. Combined with the actuator thrust this creates an extremely high seat contact and ensures a very tight shut off without relying on auxiliary balancing seals and close tolerance sealing surfaces. When opened, high-pressure steam will flood the valve to the underside of the main plug, balancing it and reducing the actuation thrusts required. This design not only provides repeatable, assured shut-off but prevents leak-induced damage to the valve seat. | |
Interchangeability Design Unique plug and seat design allows for repeatable, provides longer intervals between maintenance and allows easy access to all components of the valve. | |
Radiator Design Apply with Radiator Disc between body and actuator, protect the actuator from the overheating in working procession, ensure the stability of the actuator. | |
VALVE CONSTRUCTION AND MATERIAL
PARTS | MATERIAL | ||||
1 | Body | ASTM A105 | A182 Gr.F11 | A182 Gr.F22 | 12Cr1MoV |
2 | Bonnet | ASTM A105 | A182 Gr.F11 | A182 Gr.F22 | 12Cr1MoV |
3 | Stem | SUS304 | 12Cr1MoV | 12Cr1MoV | 12Cr1MoV |
4 | Seat | SUS304 | 12Cr1MoV+stl | 12Cr1MoV+stl | 12Cr1MoV+stl |
5 | Packing | Flexible Graphite | Flexible Graphite | Flexible Graphite | Flexible Graphite |
6 | Trim | SUS304 | 12Cr1MoV+stl | 12Cr1MoV+stl | 12Cr1MoV+stl |
7 | Cage | SUS304 | 12Cr1MoV+stl | 12Cr1MoV+stl | 12Cr1MoV+stl |
8 | Gasket | SUS304/316 | SUS304/316 | SUS316/316 | SUS316/316 |
9 | Bolt | A193 B7 | 35CrMoA | 35CrMoA | 35CrMoA |
10 | Nut | A194 2H | 35CrMo | 35CrMoA | 35CrMoA |
Throttle Area and Dimension
Type | Nominal Diameter | Cage Throttle Area | Main Disc Throttle Area | Cage No. | Maximal Flow |
NY963Y-P54/100V | DN50 | 11.8 cm2 | 16.1 cm2 | No.1 | 30t/h |
15.2 cm2 | 20.3 cm2 | No.2 | 40t/h | ||
8.4 cm2 | 11.8 cm2 | No.3 | 20t/h | ||
DN80 | 22.9 cm2 | 32.3 cm2 | No.1 | 60 t/h | |
26.9 cm2 | 36.3 cm2 | No.2 | 70 t/h | ||
17.5 cm2 | 24.2 cm2 | No.3 | 45 t/h | ||
DN100 | 36.9 cm2 | 52.7 cm2 | No.1 | 100 t/h | |
42.2 cm2 | 58.0 cm2 | No.2 | 115 t/h | ||
31.6 cm2 | 44.0 cm2 | No.3 | 85 t/h | ||
DN125 | 46.7 cm2 | 66.8 cm2 | No.1 | 130 t/h | |
55.6 cm2 | 73.4 cm2 | No.2 | 150 t/h | ||
40.1 cm2 | 55.6 cm2 | No.3 | 110 t/h | ||
DN150 | 58.9 cm2 | 82.5 cm2 | No.1 | 160 t/h | |
71.5 cm2 | 100.5 cm2 | No.2 | 190 t/h | ||
49.5 cm2 | 68.7 cm2 | No.3 | 135 t/h | ||
DN175 | 77.0 cm2 | 103.7 cm2 | No.1 | 200 t/h | |
91.1 cm2 | 122.5 cm2 | No.2 | 250 t/h | ||
63.2 cm2 | 88.0 cm2 | No.3 | 170 t/h | ||
DN225 | 106.0 cm2 | 137.4 cm2 | No.1 | 280 t/h | |
129.6 cm2 | 172.8 cm2 | No.2 | 350 t/h | ||
88.3 cm2 | 113.8 cm2 | No.3 | 230 t/h |
Type | DN | Inlet Pipe Size | Outlet Pipe Size | L | H1 | H | Weight |
 | DN150 | φ76×8 | φ108×6 | 300 | 130 | 1267 | 210 |
φ76×6 | φ108×4.5 | ||||||
φ76×8 | φ108×8 | ||||||
DN80 | φ108×12 | φ168×10 | 380 | 160 | 1400 | 318 | |
φ108×9 | φ168×9 | ||||||
φ108×10 | φ168×10 | ||||||
DN100 | φ133×14 | φ219×12 | 400 | 175 | 1415 | 385 | |
φ133×10 | φ219×11 | ||||||
φ133×12 | φ219×14 | ||||||
DN125 | φ168×18 | φ273×16 | 440 | 185 | 1515 | 428 | |
φ168×14 | φ273×13 | ||||||
DN150 | φ194×18 | φ273×16 | 460 | 190 | 1525 | 460 | |
φ194×15 | φ273×13 | ||||||
DN175 | φ219×20 | φ325×18 | 470 | 205 | 1595 | 523 | |
φ219×18 | φ325×18 | ||||||
φ219×16 | φ325×16 | ||||||
DN225 | φ273×25 | φ426×18 | 570 | 280 | 1945 | 820 | |
φ273×22 | φ426×20 | ||||||
φ273×20 | φ426×18 |
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