Description
Model ZZVMP self-regulating type nitrogen seal valve is composed of control valves, actuators and pilot, is a kind of no extra energy, using the pressure as a power source, modulated medium itself to automatically adjust the pressure constant of energy-saving products, the valve control is twice precise as general self-reliance type pressure regulating valve, suitable for requiring higher control precision. (B) after the control valve pressure (K) before the control valve.
Feature
Self-operated pressure regulator applies with the quick-opening flow characteristic, which is quickly acted and highly accurate adjusted, so it can be widely used in many fields like petroleum, chemical, electricity, metallurgy, food, textile, machinery, civilian building, and so on to reduce/release or stabilize the pressure of the gas, steam and liquid and so on.
Cage guided self-operated pressure regulator uses a self-balancing double sealing surface as a throttle member, to prevent from unauthorized change in gas pressure and the medium needs to be cleaned without particulate impurities, which is suitable for large pressure drop, to keep the manifold velocity below 150 misec, prevent vibration and reduce excessive noise emission.
Technical Specification
This type is a FAIL TO OPEN type pressure regulator, which means that the main valve will move to the fully open position in the event of diaphragm rupture of main valve or supply pressure is not available.
| Size | DN20 ~ DN100 |
| Pressure Rating | PN1.6 ~ PN6.4MPa, 150 ~ 300LB Flange |
| Standard | JB/T79.1-94. 79.2-94, ANSI B16.5 |
| Body Material | Cast iron, cast steel, stainless steel |
| Seat | Stainless steel+PTFE |
| Diaphragms | NBR, EPR, fiber-reinforced rubber, oil-resistant rubber Diaphragm Cover: Teflon coated A3, A4 steel sheet |
| Cage Guided Stem | Stainless steel |
| Noted | Regulator has a rust-proof exterior finish |
| Pressure balancing | Stainless steel bellows |
| Flow characteristic | Quick open |
| Plug type | Single-seated, double-seat |
| Working temperature | -29 ~+150°C |
| Accuracy class | AC 10% up to 100 mbar |
| AC 5% from 100 mbar to 1 bar | |
| AC 2.5% over 1 bar |
Actuator
Pressure Setting Range: 0.4~0.5, 5~10, 9~14, 13~19, 18~24, 22~28, 27~33, 36~44, 42~51, 49~58,
Spring adjustment screw cap required to protect screw against tempering. Cover with threads protected against corrosion; valve linkage is corrosion resistant.
Spring screws are protected against tampering by means of a suitable screwed seat cap or cover that can be removed without damage.
Rated Kv Value · Rated Travel · Adjusting Pressure Range (Sheet 1)
| Nominal Diameter DN(mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
|
Rated Flow Characteristic Kv |
Single- Seated | 7 | 11 | 20 | 30 | 48 | 75 | 120 | 190 | 300 | 480 | 760 | – | – |
| Cage Type | 7 | 11 | 20 | 30 | 48 | 75 | 120 | 190 | 300 | 480 | 760 | – | – | |
| Double- Seated | – | – | 22 | 33 | 53 | 83 | 132 | 209 | 330 | 528 | 836 | 1210 | 1925 | |
| Rated Travel (mm) | 8 | 10 | 14 | 20 | 25 | 40 | 50 | 60 | 70 | |||||
|
Adjusting Pressure Range (kPa) |
15~50, 40~80, 60~100, 80~140, 120~180, 160~220, 200~260, 240~300, 280~350, 330~400, 380~450,
430~500, 480~560, 540~620, 600~700, 680~800, 780~900, 880~1000, 950~1100, 1080~1250, 1230~1400, 1380~1550, 1530~1800, 1780~2000, 1980~2300, 2280~2500 |
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Main Parameters For Micro-Flow, Single-Seated (Sheet 2)
| Nominal Diameter DN(mm) | 20, 25 | ||||||||||||
| Seat Diameter(mm) | 6 | 7 | 8 | 10 | 12 | 15 | |||||||
| Rated Flow Characteristic Kv | 0.01 | 0.02 | 0.048 | 0.06 | 0.08 | 0.12 | 0.2 |
0.32 |
0.5 | 0.8 | 1.8 | 2.8 | 4.4 |
| Rated Travel (mm) | 5 | ||||||||||||
Flow Coefficient(CG): ZZVMP
| Size（mm） | 25 | 50 | 80 | 100 | 150 | 200 |
| CG | 428 | 2000 | 4000 | 6300 | 11000 | 19291 |
Allowable Velocity:
This type using the balancing hole design, which is used for control velocity and noise. Velocity of gas at regulator outlet flange shall be calculated using the following formula:
V=Q/A=Q/(ΠD2/4)
V is the average fluid velocity in the pipe in ft/sec.
Q is volumetric flow rate (cfs)
A is cross-sectional area of flow=ΠD2
D is the diameter of the pipe in ft
| Valve Size | Maximum Allowable Velocity v [m/s) |
| 2’’ | 120 |
| 3’’ | 125 |
| 4’’ | 150 |
