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Emerson 788 DVC - page 1
Oper at i ng an d Maint ena nc e I ns t r uc t i ons Par t Number- 3- 9008 -556 Rev i si on D December 2012 Danie l Model 788 DVC digit al cont rol TM valves 2" , 3" , 4", 6" and 8" si zes ...
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Emerson 788 DVC - page 2
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Emerson 788 DVC - page 3
Important safety instructions Daniel Measurement and Control, I nc. (Daniel) designs, manufactures and tests products to function withi n spec ific con dition s. Bec ause the se pr oducts are sophist icated te chnica l instr uments , it is important that the owner and oper ation personnel strictly adhere both to the information printed on the produ ...
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Emerson 788 DVC - page 4
Produc t opera tion pe rsonnel: • To prevent personal injury , personnel must follow all instructions of t his manual prior to and duri ng ope ratio n of the pr oduct. • Follow all warn ings, cauti ons, and no tices mark ed on, a nd supp lied with, th is produc t. • Ver ify tha t this is th e co rrec t instr ucti on ma nual f or y our Da niel ...
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Emerson 788 DVC - page 5
Safety s ignal words an d symbols Pay spec ial a ttenti on to t he fo llowi ng signa l words, s afe ty a lert sy mbols a nd sta teme nts: In d i c a t es a h a z a r d o u s s i t u a t i o n w h i c h , i f n o t a v o i d e d , w i l l r e s u l t i n d e a t h o r s e r i o u s i n j u r y. W a r n i n g i n d i c a t e s a h a z a r d o u s s i ...
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Emerson 788 DVC - page 6
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Emerson 788 DVC - page 7
N otice THE C ONTENTS OF THI S P UBL ICAT ION AR E PRES ENT ED FO R I NF ORMATI ONAL PUR POSES ONLY, AND W HILE EVERY EFFO RT H AS BEEN M A DE TO ENSU RE THEIR ACCURACY , THE Y ARE N OT TO BE CONS TRUED AS W ARRANT I ES OR GUARANTEE S, EXPRES SED OR IMPL IED , REGAR DI NG THE PRODU CTS OR SERVICES D ESCRIBED HEREIN OR TH EIR USE OR APPLI CABILITY. ...
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Emerson 788 DVC - page 8
W arranty an d li m itati on of liabil ity 1. L IM IT E D W A RR A N T Y : Su bje c t to the lim itation s co nta ine d in Se c tion 2 h e rein, D an iel M ea sure m e nt & C o n tro l, Inc. (“ D aniel”) warrant s t hat the l icensed f irmware embo died in t he G oo ds wil l execute the programming inst ructions pro vid ed b y D a niel, a n ...
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Emerson 788 DVC - page 9
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM TABLE OF C ONTENTS i TABLE OF C ONTENTS 1 . 0 I N T R O D U C T I O N ..................................................... 1-1 1 . 1 A g g r e s s i v e P r o d u c t s .............................................. 1-1 1 . 2 P r i n c i p l e o f O p e r a t i o n ....................... ...
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Emerson 788 DVC - page 10
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM TABLE OF C ONTENTS ii Figures 2 - 1 C l o s e d P o s i t i o n ....................................................... 2-2 2 - 2 O p e n - C o n t r o l P o s i t i o n ................................................. 2-3 2 - 3 O p e n P o s i t i o n ( n o c o n t r o l )............. ...
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Emerson 788 DVC - page 11
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM INTROD UCTION 1-1 1.0 IN TRODUC TION The Da niel Mode l 788D VC Digit al Control V alve is a sole noid opera ted devic e desig ned to TM prov ide pr ecise fl ow ra te contr ol and ba tch deliv ery of liquid produc ts. I t is us ed in c onjunctio n with an e lectr onic batc h control d evic ...
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Emerson 788 DVC - page 12
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM INTROD UCTION 1-2 1.2 Principle of Operation Operation of the Model 788DVC Digital Control Valve is based on a balance d piston principle. When pressure on both sides of the main valve piston are equal, a spring (located on the top of the piston) acts as a differ ential force and closed ...
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Emerson 788 DVC - page 13
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM THEORY OF OPER ATION 2-1 2.0 THEORY OF OPERAT ION The Model 700B Series Control Valve operates on a balanced-piston principle. When pressures on both sides of the piston are equalized, a spring located on top of the piston acts as a differential forc e and closes the piston. When the press ...
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Emerson 788 DVC - page 14
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM THEORY OF OPER ATION 2-2 CLOSED POSI TION - The normally closed solenoid is closed. The normally open solenoid i s open. Y-port (P3) to Z-port (P2) is closed. X-port (P1) and Y-port (P3) pressures are balanced. The main valve spring being the differential forc e, closes the piston and ke ...
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Emerson 788 DVC - page 15
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM THEORY OF OPER ATION 2-3 OPEN - CONTROL POSITI ON - The normally closed solenoid is closed. The normally open solenoid i s closed. Y-Port (P3) to Z-port (P2) is closed. X-port (P1) to Y-port (P3) is closed. The product cannot flow to or from the top of the piston. The pist on is hy draulic ...
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Emerson 788 DVC - page 16
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM THEORY OF OPER ATION 2-4 OPEN POSITI ON - (no control) - The norm ally closed s oleno id is o pen. The no rmally open s oleno id is close d. Y- port (P3) is ope n to Z-port (P2). X-port (P1) is closed off by the normally open solenoid. The pressure on the bottom of the piston (P1) is gre ...
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Emerson 788 DVC - page 17
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM SPECIFICATIONS 3-1 3.0 SPECIFICATIONS PERSON AL IN JURY AND/ OR EQU IPMEN T DAM AGE Do not ex ce ed spe cific atio ns li sted b elow. Failu re to h eed th is warn ing cou ld result i n serious in jury and/or dama ge to t he e quipme nt. Pre ssure Clas s 150 lb., 300 lb., or 600 lb. ANSI st ...
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Emerson 788 DVC - page 18
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM SPECIFICATIONS 3-2 I NMETRO Certification: - Certificate Number: NCC 12.1244 X - I NMETRO Marking: Ex d nC I IB T3 Gc Ex d I I C T* Gb *See Table s 1 and 2 in the c ert ific ate fo r tempera ture ra nge deta ils. Speci al condition for s afe use: Whe n the dig ital c ontr ol valve is ass ...
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Emerson 788 DVC - page 19
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM SPECIFICATIONS 3-3 The ma in valve is full open w hen cur ves B, C, and D inte rsec t Curve A. Afte r they inters ect, cont in ue reading pressure drop curve f rom curve A. I n applications requiring a constant pressure drop over 40 psid a heavy main valve spring must be used. Curve s A, B ...
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Emerson 788 DVC - page 20
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM SPECIFICATIONS 3-4 Materials of Construction Main Va lve Body stee l, ASTM -352 L CC Cylinder Head stee l, ASTM -352 L CC Main Valve Cylinder steel nickel coated steel Main Valve Piston Standard: stainless steel Seat Ring steel nickel coated steel Seals steel O-rings Standard: Viton dy n ...
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Emerson 788 DVC - page 21
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM SPECIFICATIONS 3-5 Other Internal Parts stainless steel Pilot Valve Body and Trim stainless steel Tubing steel or stainless steel Table 3-1. Solenoid Electrical Data ( 150 lb. MOPD) V oltage* Current (Inrus h) Current Ho lding 110/ 50 Vac 0. 71 amps 0. 37 amps 120/ 60 Vac 0. 65 amps 0. 34 ...
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Emerson 788 DVC - page 22
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM SPECIFICATIONS 3-6 Table 3-2. Maximum Working Pressure Pressure/Tem peratu re ASTM A352 LCC WCB 150# ANSI/- 20 to 100 / F 285 psig WP 150# ANSI/150 / F 272 psig WP 150# ANSI/250 / F 245 psig WP 150# ANSI/450 / F 185 psig WP 300# ANSI/- 20 to 100 / F 740 psig WP 300# ANSI/150 / F 707 psig ...
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Emerson 788 DVC - page 23
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM SPECIFICATIONS 3-7 Figure 3-2. Dimensions ...
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Emerson 788 DVC - page 24
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM SPECIFICATIONS 3-8 Table 3-3. Dimensions (see Figure 3-2) Valve Size A 150# AN SI A 300# AN SI 1 B No Indicator 2 B With Indicator C 2" 10-1/4" 10-1/2" 9" 11" 8.25" 260 mm 267 mm 229 mm 279 mm 210 mm 3" 11" 11" 9" 12" 8-3/4" 279 ...
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Emerson 788 DVC - page 25
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM INSTALLATION AND MAINTENANCE 4-1 4.0 INSTALLATION AND MAINTENANCE The most common application of the Daniel Model 788DVC Digital Control Valve is for truc k loadin g of petr oleum p roducts. The valve may be used w ith a va riety of flow meter ty pes, includ ing Coriol is and turbine me te ...
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Emerson 788 DVC - page 26
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM INSTALLATION AND MAINTENANCE 4-2 EQUIP MENT D AMAG E It is recom mended that the exte rnal pump control be turned to the OFF position when performing any electric al wiring in stallation and until ini tial control valve adjustments are m ade in the DL8000. Failure to comply with these pr ...
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Emerson 788 DVC - page 27
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM INSTALLATION AND MAINTENANCE 4-3 The Da niel va lve ma y be insta lled with a flow dire ction hor izonta l or ve rtical up but should never be installed with flow direction vertica l down. When installed in a horizontal li ne, the valve should be insta lled s o tha t the c y linder h ead i ...
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Emerson 788 DVC - page 28
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM INSTALLATION AND MAINTENANCE 4-4 Figure 4-1. Ty pical Application - Top Loading ...
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Emerson 788 DVC - page 29
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM INSTALLATION AND MAINTENANCE 4-5 Figure 4-2. Ty pical Application - Bottom Loading ...
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Emerson 788 DVC - page 30
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM INSTALLATION AND MAINTENANCE 4-6 Figure 4-3. Control Valve Configuration (new for DL 8000) ...
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Emerson 788 DVC - page 31
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM DISASSEM BLY AND R EASSEMBLY 5-1 5.0 CYLINDE R DISASSEMBLY AND REASSEM BLY The following tools will be needed to disassemble and re assemble y our control valve: • socket wrench • adjustable wrench • T-handle or extended Allen wr ench • arb or pr ess (may be ne eded for 4- and 6- i ...
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Emerson 788 DVC - page 32
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM DISASSEM BLY AND R EASSEMBLY 5-2 5.2 Cylinde r Di sasse mbly Refer to Figure 5-2. PERSON AL IN JURY AND/ OR EQU IPMEN T DAM AGE Caut ion is r equire d when perfor ming any disa sse mbly proc edure as the Cylinde r head is bolted to a spring loaded cylind er assem bly. Service should only ...
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Emerson 788 DVC - page 33
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM DISASSEM BLY AND R EASSEMBLY 5-3 6. L ift of f the cy linde r he ad by takin g out the so cket scre ws. 7. Remove and inspect all O-rings for nicks, cuts and we ar. Figure 5-1. Using the Piston to Insert the Sea t Ring into the 150/300 lb. Cylinder Table 5-l. Ty pical Opening/Closing Speed ...
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Emerson 788 DVC - page 34
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM DISASSEM BLY AND R EASSEMBLY 5-4 5.3 Cylinder Reasse mbly Refer to Figure 5-2. 1. Inspect a ll O-rings for wear and dama ge and replace as required. 2 . If r e m o v e d , a t t a c h t h e c yl i n d e r h e a d t o t h e m a i n c yl i n d e r b o d y. 3. Insert the va lve spring into ...
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Emerson 788 DVC - page 35
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM DISASSEM BLY AND R EASSEMBLY 5-5 5.4 Cup-se al Re place me nt on Ex isting “AP” Option Pi ston I f y our Daniel Valve is being modified t o accommodate applications requiring the use of aggressive prod ucts u sed in petr oleum ble nding op erations , the follo wing proc edure s should ...
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Emerson 788 DVC - page 36
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM DISASSEM BLY AND R EASSEMBLY 5-6 Figur e 5-3. Option Asse mbly ...
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Emerson 788 DVC - page 37
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM DISASSEM BLY AND R EASSEMBLY 5-7 5.4.2 To upgrade existing valves having the origi nal “AP” option (received prior to September 1992), the follo wing part s have been sup plied a s a sepa rate kit: - washers (29) - Stat-O-Seals (30) - one gasket (31) - three O-rings (r eplaces existing ...
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Emerson 788 DVC - page 38
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM DISASSEM BLY AND R EASSEMBLY 5-8 PERSON AL IN JURY AND/ OR EQU IPMEN T DAM AGE Caut ion is r equire d when perfor ming any disa sse mbly proc edure as the Cylinde r head is bolted to a spring loaded cylind er assem bly. Service should only b e perform ed by trained and qualifie d servic ...
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Emerson 788 DVC - page 39
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM TROUBLESHOOTING 6-1 6.0 TROUBLESHOOTING The mos t frequ ent pro blem enc ountere d with any contr ol valve is t he acc umulat ion of se diment, rouge, scale and other for eign material in the pilot or its supply sy stem. It is, therefore, good pra ctice to pe riodic ally remove the pil ot ...
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Emerson 788 DVC - page 40
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM TROUBLESHOOTING 6-2 Table 6-1 provides information for identify ing and correcting operational proble ms you may experience with y our control valve. Please ke ep in mind this information is not exhaustive and tha t sy stem abnormalities may result from c auses other than valve error. Th ...
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Emerson 788 DVC - page 41
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM PART S LIST 7-1 7.0 P ARTS LIST Table 7-1 lists the repla cement pa rts for 2- throu gh 6-inc h Model V2700-2 0 Series Contr ol Valve s. The item numbers in the parts list (Table 7-1) corr espond with the sequenc e numbers in Figure 7-1. This s ectio n con tains the necessa ry pa rts requ ...
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Emerson 788 DVC - page 42
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM PART S LIST 7-2 Table 7-1. Parts L ist - 2", 3", 4", 6", 8" Sizes Item Description Qty 2-inch 3-inch 4-inch 6-inch 8-inch 1 val ve body - in line 150 ANSI steel 1 521001 531001 541001 561001 581001 2 solenoi d (N.C. ) 110/50, 120/60 220/50, 240/60 1 456800-612 45 ...
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Emerson 788 DVC - page 43
DANI EL MODEL 7 88DVC DIGI TAL CONTROL V ALVES DE C 2012 TM Item Description Qty 2-inch 3-inch 4-inch 6-inch 8-inch PART S LIST 7-3 21 O-ring /Buna-N O-ring /Viton ® O- rin g/ EPR 1 --- --- --- 157079 157079-022 157079-005 150727 157078-022 157078-005 150727 157061-022 157061-005 CF CF CF 22 O-ring /Buna-N O-ring /Viton ® O- rin g/ EPR 1 --- --- ...
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Emerson 788 DVC - page 44
DE C 2012 DANI EL MODEL 7 88DV C DIGI TAL CON TROL VALVE S TM PART S LIST 7-4 Figur e 7-1. Valve Cy linde r Assembl y ...
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Emerson 788 DVC - page 45
D aniel M easurement and C on trol, Inc. TM Ret urne d M at eri al Aut hori zat ion Repai r For m for Us ed Equipm ent Includin g Dec ontamina tion/ Cleani ng Stat ement A Return Material Authorization (RMA) number must be obtained prior to returning any equipment for any reason. Download the RMA form from the S upport Services web page by selectin ...
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Emerson 788 DVC - page 46
Sh ipping R equ ire m ents Failur e to com ply with this pr ocedure will re sult in t he ship me nt being refused. 1. Write the RMA number on the shipping package. 2. I nsi de th e pa ck ag e i nc lud e o ne cop y o f thi s do cu me nt an d a ll r equ ire d M ate ria l Sa fe ty Da ta Shee ts (MSD S) 3. Outside of the pac kage atta ch one copy of th ...
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Emerson 788 DVC - page 47
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Emerson 788 DVC - page 48
Emers on Pr oces s Manage ment Daniel Measurem ent and C ontrol , Inc. 11 10 0 B ritt m oo re Park D rive Houst on, TX 77041 T+1 7 13- 467-600 0 F+1 7 13- 827-480 5 ww w . emer son. com Copy r i ght © 2012 Dani el M eas ur ement and Co nt r ol , I nc. and Dani el M eas urement Ser vi ces , I nc. Div is ion s of Emers on Pr oces s Management res er ...
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