The 30D12Y 30D12R pilot-operated (after valve) pressure control valve

Summary The30D12Y/30D12R pilot-operated (after valve) pressure control valve is composed of the control valve ,pilot and actuator .It is suitable for controling differential pressure in the pipes of non-crrosive liquids, gases and steams. when the diferential pressure rises, the control valve is closed . The main features are as follows: 1. It has the pressure balancing function 2. Low noise, reliable performance, free of maintenance 3. The standard modular design is adopted. 4. High control precision Body DN 15.20.25.32.40.50.65.80.100.125.150.200.250mm PN Class150.300 Flange standard ANSI.JIS.DIN GB JB(special standards can be offered according to user requirements) Body material WCB.CF8.CF3.CF8M.CF3M Plug material Hard seal Stainless steel (304.316.316L) Soft seal Stainless steel embedded with rubber ring Pressure balancing Stainless steel bellows (DN15~125), balanced diaphragm (DN150~250) Actuator Effective area (cm2) 250 Pressure setting range 0.01~0.12 0.08~0.25 0.2~0.5 0.45~1 0.6~2.0 Minimum differential pressure that ensures normal work of the pressure valve DN15~125 0.08 DN150~250 0.1 Allowable maximum differential pressure between the upper and lower diaphragm chambers 0.4 Material galvanized steel sheet; diaphragm: EPDM or FKM with fiber Control pipeline connection Copper pipe o r steel pipe Φ10X 1(mm); ferrule connect ion: R1/4" Note: ※The pressure setting range corresponding to the effective area does not apply to valves with DN150-250. Performance Set value error ±4% Allowable leakage (under stipulated testing conditions) Hard seal 4×0.01% valve rated capacity Soft seal DN15~50 DN65-DN125 DN150~250 10 bubbles/ min 20 bubbles/min 40 bubbles/min Structural figure 1Body 2Seat 3Stem 4 Before-valve pressure P1 pipe 5 Balanced bellows 6 Travel indicator 7 Diaphragm 8 Spring 9 Operating pressure Ps pipe 10 After-valve pressure P2 pip 11 Pilot 12 Pilot plug 13Spring 14 Bellows 15 Adjusting screw 16 Adjustable needle valve Allowable working temperature DN 15~125mm 150~250mm seal type Hard seal ≤150℃ ≤140℃ Cooling tank≤200℃ Cooling tank and extension ≤200℃ Cooling tan k and heat sink ≤350℃※ Cooling tank and extension ≤300℃※ Soft seal ≤150℃ Note: ※It indicates the allowable working temperature is valid only when the medium is steam Rated flow coefficient, noise measuring coefficient, allowable differential pressure DN 15 20 25 32 40 50 65 80 100 125 150 200 250 Rated flow coefficient 4 6.3 8 16 20 32 50 80 125 160 280 320 450 Noise measuring coefficient Z value 0.6 0.6 0.6 0.55 0.55 0.5 0.5 0.45 0.4 0.35 0.3 0.2 0.2 Allowable differential PN16 1.6 1.5 1.2 1 pressure (Mpa) PN40 2 Working principle After throttling by the plug and seat, the before-valve pressure P1 of the process medium is changed into the after-valve pressure P2. Through the control pipeline, P1 is input to the upper diaphragm chamber of the actuator and acts on the top disc. The acting force produced balances the reacting force of the spring, determining relative positions of the plug and seat and controlling the before-valve pressure. W hen the before-valve pressure P1 increases, the acting force of P1 that acts on the top disc will increase accordingly. At the time, the acting force on the top disc is higher than the reacting force of the spring to make the plug move away from the seat, until the acting force on the top disc balances the reacting force of the spring. At the time, the flow area between the plug and seat is increased, the flow resistance becomes lower and P1 is reduced to the set value. Likewise, when the before-valve pressure P1 decreases, the acting direction is reverse to the above. This is the working principle during the control of before-valve pressure. When it is necessary to change the set value of before-valve pressure P1, please adjust the adjusting nut. I. Dimensions and weight of control valve DN (mm) 15 20 25 32 40 50 65 80 100 125 150 200 250 L (mm) 130 150 160 180 200 230 290 310 350 400 480 600 730 B (mm) 212 212 238 238 240 240 275 275 380 380 326 354 404 Weight (Kg) 6.2 6.7 9.7 13 14 17 29 33 60 70 80 140 220 B1(mm) - - - - - - - - - - 630 855 1205 Weigh(Kg) - - - - - - - - - - 140 210 300 II. Dimensions and weight of actuator Effective area (cm ) 250 R (mm) 263 H (mm) DN15~125 150 DN150~250 440 Weight(Kg) 18 22