在程序设计中，为完成某一功能所需的一段程序或子程序；或指能由编译程序、装配程序等处理的独立程序单位；或指大型软件系统的一部分。

模块,又称构件,是能够单独命名并独立地完成一定功能的程序语句的集合（即程序代码和数据结构的集合体）。它具有两个基本的特征：外部特征和内部特征。外部特征是指模块跟外部环境联系的接口（即其他模块或程序调用该模块的方式，包括有输入输出参数、引用的全局变量）和模块的功能；内部特征是指模块的内部环境具有的特点（即该模块的局部数据和程序代码）。

模块有各种类型，如单元操作模块（换热器、精馏塔、压缩机等）、计算方法模块（加速收敛算法、最优化算法等）、物理化学性质模块（汽液相平衡计算、热焓计算等）等。

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NEW MANUAL STAINLESS 2-1/2 IN NPT BALL VALVE D299917

MILWAUKEE 600WOG 150S BRASS THREADED 1-1/2 IN NPT BALL VALVE B267918

NEO 425 STAINLESS 1 IN NPT 600 THREADED BALL VALVE B420433

DM340 250PSI CF8M STAINLESS 1-1/2 IN NPT BALL VALVE B317707

HENRY 904600 500PSI CWP BRASS BUTT WELD 1-5/8 IN BALL VALVE B294247

TRUELINE 515 1-1/2 IN 150 STAINLESS FLANGED BALL VALVE B460155

PROCOL A105N DN 40/32 1.4408 1-1/4 IN STAINLESS SOCKET WELD BALL VALVE B416271

APOLLO 600 WOG CII CONBRACO BRONZE THREADED 1-1/2 IN NPT BALL VALVE B273439

RED-WHITE 4880 NACE-MR0175 2000PSI-WOG STAINLESS 1-1/2 IN NPT BALL VALVE B355404

JENKINS 1-1/2 IN NPT 150 WSP BRONZE THREADED BALL VALVE B381249

NEW NIBCO F-515-S6-F-66-FS NSR 8 F05 STAINLESS FLANGED 1IN BALL VALVE D261678

JAMESBURY EJ-20E 115V 1.5A AMP ELECTRIC ACTUATOR STAINLESS BALL VALVE B414991

ITT GRINNELL 720 CWP STAINLESS THREADED 1-1/4 IN NPT BALL VALVE B363854

NELES JAMESBURY 7150-31-3600MTT-2 3 IN 150 STAINLESS FLANGED BALL VALVE B476606

FNW 600-150 FULL PORT BODY CF8M 150 STAINLESS FLANGED 2 IN BALL VALVE B243924

NELES JAMESBURY 5150 31 3600MT EJ-20 ACTUATOR 150 FLANGED 2IN BALL VALVE B248924

NA VGSS 1113 BKH 3/4 NPT BALL VALVE LOCKABLE HANDLE B296394

APOLLO 82-244-01 STAINLESS STEM/BALL 3 PIECE BRONZE 3/4 IN BALL VALVE B323977

FLOWSERVE 1PT4466XGSE R3 STAINLESS THREADED 1 IN NPT BALL VALVE 1440CWP D218059

WORCESTER CONTROLS PNEUMATIC 150 STAINLESS FLANGED 6 IN BALL VALVE B250505

WHITEY SS-6511 C/W ACTUATOR 2200PSI STAINLESS FLANGED 1-1/2IN BALL VALVE B214625

NEW NELES JAMESBURY 1/2 A 3600TT STAINLESS 1/2IN NPT BALL VALVE 2000CWP D216393

RUB CW617N STAINLESS STEM/BALL CWP DN25 300 BRASS 1 IN NPT BALL VALVE B312367

VALPRES 140 2000 WOG 1/2 IN NPT STAINLESS THREADED BALL VALVE B404639

FNW 500-150 4 BOLT CF8M 150 STAINLESS FLANGED 2 IN BALL VALVE B313706

VELAN 01413-SSGA CF8M HYTORK-221 2 IN 150 STAINLESS FLANGED BALL VALVE B481379

FLUTEC KHM-G11/2-1112 DN40 PN315 STAINLESS 1-1/2 IN NPT BALL VALVE B297637

HABONIM 47P-6666RT/NPT 1/2IN NPT PNEUMATIC C20 1500 STAINLESS BALL VALVE B391595

FLOW 50B-92 CONTROL STAINLESS FLANGED 1 IN BALL VALVE B206442

NEW WORCESTER CONTROLS 4466RT STAINLESS THREADED 3/4IN NPT BALL VALVE D360733

NEW ECOLAB 8525-4035 PVC THREADED 1/2IN NPT BALL VALVE D332004

CII APOLLO 600WOG BRASS THREADED 3/4 IN NPT BALL VALVE B354811

NELES JAMESBURY 2 4A 3600 MT1 STAINLESS 2IN NPT BALL VALVE PNEUMATIC D206984

NELES JAMESBURY C15-R21C SEGMENTED STAINLESS FLANGED 1-1/4 IN BALL VALVE B273468

NEW APOLLO 2 WAY 600 STAINLESS THREADED 1/ IN NPT BALL VALVE B264489

FNW FULL PORT BODY CF8M CLASS 1 IN 150 STAINLESS FLANGED BALL VALVE B471845

SWAGELOK SS-63TS8-JL 2200PSI 1/2 IN NPT STAINLESS THREADED BALL VALVE B395159

WORCESTER CONTROLS MK005 PNEUMATIC THREADED 1-1/2IN NPT BALL VALVE B279795

WORCESTER CONTROLS 1-1/2 BWK446 6T 1-1/2 IN TRI-CLAMP BALL VALVE D447489

APOLLO 82-244-01 STAINLESS STEM FULL PORT 3PIECE BRONZE 3/4IN BALL VALVE B326947

GRINNELL 8VR 275CWP 150 STAINLESS FLANGED 1 IN BALL VALVE B206487

CONBRACO APOLLO 1 IN NPT 1500 STAINLESS THREADED BALL VALVE B462581

PBM SIH-36-TT3 CF8M 2 WAY STAINLESS 2 IN BALL VALVE B314260

NEW MARWIN 7444RTRS PNEUMATIC STAINLESS THREADED 1 IN NPT BALL VALVE D303139

NEW CONBRACO 77-105-27 APOLLO 600 BRONZE THREADED 1IN NPT BALL VALVE D366737

VALMET? CF8M CLASS 150 STAINLESS STEEL 4-BOLT FLANGED 1IN BALL VALVE B204749

NELES JAMESBURY 5150-31-3600TT 3 IN 150 STAINLESS FLANGED BALL VALVE B460010

NEW WAUKESHA 4308-0718-10 1-1/2 IN STAINLESS TRI-CLAMP BALL VALVE D403201

JOHN VALVES 2000 WOG 10 BAR 1-1/2 IN STAINLESS THREADED BALL VALVE B428187

NEW WORCESTER CONTROLS 416RT 1/2 IN SOCKET WELD BRASS BALL VALVE D482022

NEW MUELLER A-17260 BALLMASTER REFRIGERATION 3/8 IN ODS BRASS BALL VALVE B420437

SHARPE SPN II 063 1000 WOG SPN II 063 3/4IN NPT 150 STAINLESS BALL VALVE B385057

NEW GEMINI A411 34203 PNEUMATIC STEEL THREADED 1/2IN NPT BALL VALVE D332132

NEW W.E. ANDERSON BV2F307-SV AIR 1000 WOG STAINLESS 2IN NPT BALL VALVE D245694

NEW WORCESTER CONTROLS R2CWP1000 BRASS THREADED 3/8IN NPT BALL VALVE D265702

APOLLO CII CONBRACO 600WOG 2 WAY THREADED 3/4IN NPT BALL VALVE B274858

JAMESBURY A150F3600MTRF 4 IN 150 STEEL FLANGED BALL VALVE B467001

NELES JAMESBURY 4C3600XT2 2 IN STAINLESS SOCKET WELD BALL VALVE B445769

NEW WORCESTER CONTROLS 11/2BGPWK4466TTC 1-1/2 IN TRI-CLAMP BALL VALVE D447499

NEW SFERACO 50801 FIG151 FLOATING STEEL VS505 DN80 3IN BALL VALVE B252408

HISAKA TYPE HS 150LB 230PSI ASTM CF8M TFE STAINLESS 2IN NPT BALL VALVE B213885

SWAGELOK SS-45S8-LL 40 SERIES STAINLESS 2 WAY 1/2IN NPT BALL VALVE B213971

NEW WORCESTER CONTROLS 4416T V46 MK536 CWP1000 3/4IN NPT BALL VALVE D224512

HYDAC KHM-50-NPT-1114 STEEL THREADED 2 IN NPT BALL VALVE B355604

NEW NELES JAMESBURY SP26SR60-B AIR STAINLESS 150 2IN NPT BALL VALVE D265406

KTM E0162-32E-15L-SB11 3 IN PNEUMATIC 150 STAINLESS FLANGED BALL VALVE B402012

DURCO AKH3 PNEUMATIC 150 STEEL FLANGED 2 IN BALL VALVE B208412

WHITEY SS-62TSW6T 3600PSI 3/8IN NPT STAINLESS SOCKET WELD BALL VALVE B406717

JAMESBURY 1 A 1100-TTM0D B STEM 500 WOG 1 IN NPT 150 BRASS BALL VALVE B409400

FNW 220 2000WOG 1/2 IN NPT STAINLESS THREADED BALL VALVE D468848

GRINNELL BVR HINDLE 1X3/4 IN 150 STAINLESS FLANGED BALL VALVE B472391

NEW WORCESTER 1-1/2 4416TSE MK539 FLOWSERVE BRASS 1-1/2IN NPT BALL VALVE D222628

NEW MAS 0206 3/4 IN NPT 2000 STAINLESS THREADED BALL VALVE B416119

NEW GENEBRE 2015 DN32 316 1-1/4 IN NPT STAINLESS THREADED BALL VALVE B414588

NELES JAMESBURY 4 50150 31 3600 TT 150 STAINLESS FLANGED 4 IN BALL VALVE B208946

VELAN S08-K1813-SSG 1000WOG CF8M 2 IN PNEUMATIC BALL VALVE B389779

VELAN S08-M1113-SSG VALVAC 1500PSI-WOG STAINLESS 2 IN NPT BALL VALVE B355430

SHARPE SP063N 145PSI PNEUMATIC ACTUATOR 3/4 IN NPT THREADED BALL VALVE B364721

NEW WORCESTER CONTROLS 4416RTSE R2CWP1500 BRASS 3/4 IN NPT BALL VALVE D261926

BI-TORQ GV-305F-TC-020 IS3TC20100SR 1000 STAINLESS 2 IN BALL VALVE B287453

NEW BI-TORQ GV-305F-TC-020 IS3TC20100SR 1000 STAINLESS 2IN BALL VALVE B288638

BI-TORQ GV-305F-TC-020 IS3TC15100SR 1000 BUTT WELD 1-1/2 IN BALL VALVE B292217

NEW COLONIAL V07106N TRUE-union PP/VITON PVC 1/2 IN BALL VALVE B334789

FLUTEC KHM-G3/4-3312 PN315 DN 20 STAINLESS THREADED 3/4IN NPT BALL VALVE B297614

NEW NIBCO NSF-PW PVC-I CHEMTROL 150PSI TRU-BLOCK PVC 1 IN BALL VALVE B251753

NELES JAMESBURY 5150-31-3600MT 2 IN 150 STAINLESS FLANGED BALL VALVE B466871

FLOWSERVE B34S PNEUMATIC STAINLESS THREADED BALL VALVE B416632

FNW 1500WOG 2 IN NPT STAINLESS THREADED BALL VALVE D472851

NEW SPEARS 1839-005C VITON 235PSI CPVC THREADED 1/2IN NPT BALL VALVE D364966

VELAN S07-M1113-SSG VALVAC STAINLESS THREADED 1-1/2 IN NPT BALL VALVE B355446

FNW 1500WOG 2 IN NPT STAINLESS THREADED BALL VALVE D464117

NEW APOLLO 70-101-2741 2 WAY BRASS THREADED 1/4 IN NPT BALL VALVE B272372

DEZURIK A2329 KTM CF8M SEGMENTED 150 STAINLESS 8IN FLANGED BALL VALVE B244924

NEW GUARDIAN AP620-335H 2 WAY 1000WOG STAINLESS 1 IN NPT BALL VALVE B235030

WATTS S8500 CWP REGULATOR 3/4 IN NPT 1000 STAINLESS THREADED BALL VALVE B414164

FNW FULL PORT BODY CF8M CLASS 1 IN 150 STAINLESS FLANGED BALL VALVE B471847

NEW CONTROMATICS CF-8M THREADED 1-1/4IN NPT BALL VALVE 1500WOG D302274

NAS CF8M 1000 WOG 3/4 IN NPT STAINLESS SOCKET WELD BALL VALVE B384065

NEW WORCESTER CONTROLS 1 4416USE BRASS THREADED 1 IN NPT BALL VALVE D272800

WORCESTER CONTROLS 3/4B4446PMSE ACTUATOR 10 120PSI 3/4 IN NPT BALL VALVE B210920

SUPERIOR 587WA-12ST INTEGRA SEAL REFRIGERATION 3/4 IN BRASS BALL VALVE B420054

JOUKA NS50 NP25 STEEL 2 IN BUTT WELD BALL VALVE B298142

NELES JAMESBURY A150 31 3600MT 2 IN PNEUMATIC 150 STAINLESS BALL VALVE D471004

JAMESBURY 5150 31 3600TT 2 IN PNEUMATIC 150 STAINLESS FLANGED BALL VALVE D471516

NELES JAMESBURY 2 5150 31 3600 TT 2 IN 150 STAINLESS FLANGED BALL VALVE D445561

MILWAUKEE 600WOG CLASS 150 BRASS THREADED 3/4 IN NPT BALL VALVE B266662

APOLLO 70-101-01 CONBRACO 600 BRASS THREADED 1/4 IN BALL VALVE B274910

NEW HOKE 7222F6Y 3/8 IN NPT STAINLESS THREADED BALL VALVE D478654

MUELLER A-17262 REFRIGERATION BI-DIRECTIONAL 5/8 IN ODS BRASS BALL VALVE B420363

WORCESTER CONTROLS E4446RTSW FLOWSERVE 1/2 IN SOCKET WELD BALL VALVE D422491

WORCESTER 1-1/2B416PMSF SERIES 39 PNEUMATIC 1000 1-1/2 IN NPT BALL VALVE B355691

MARWIN 8733FTRS-20A PNEUMATIC 1000 STAINLESS THREADED 2IN NPT BALL VALVE B305550

NELES JAMESBURY 2 IN PNEUMATIC 150 STAINLESS FLANGED BALL VALVE D471006

NEW AVS SHUT OFF CF8M STAINLESS THREADED 3/4 IN NPT BALL VALVE B298302

NEW RB 2500 600WOG 150 BRASS THREADED 1-1/2 IN NPT BALL VALVE B316793

JAMESBURY D150F 36TT FF 3 IN 150 STAINLESS FLANGED BALL VALVE D474787

NEW PROCOL 20 1/2 IN 3 PIECE STAINLESS SOCKET WELD BALL VALVE B406529

AVCO SVF NB 4488NG BV1004 1500 STEEL THREADED 1-1/2 IN NPT BALL VALVE D223244

NEW NIBCO T590Y-66 3 IN NPT ELECTRIC 600 BRONZE THREADED BALL VALVE B469012

NEW MILWAUKEE 20SSOR-02-LL 2000WOG 3/8 IN NPT STAINLESS BALL VALVE D425378

WORCESTER 11/2B4446PMSW-R2 20-39-SN STEEL SOCKET WELD 1-1/2IN BALL VALVE B214744

NEW NELES JAMESBURY 1000CWP 300 STAINLESS BUTT WELD 1/2 IN BALL VALVE B207974

DYNA-QUIP 1/4 IN NPT BRASS THREADED BALL VALVE D473186

SHARPE 50M76 1000 CWP 1/2 IN NPT STAINLESS THREADED BALL VALVE D471302

FNW 2000WOG 1/4 IN NPT STAINLESS THREADED BALL VALVE D467830

NELES JAMESBURY 3 5150 31 3600 MT ELECTRIC 150 FLANGED 3 IN BALL VALVE B208942

BETTIS VELAN EE1000 RPB250-SR3 ACTUATOR STAINLESS 3/4IN NPT BALL VALVE B211944

NELES JAMESBURY 1/2 530S-31-3600-TT PNEUMATIC STAINLESS 1/2IN BALL VALVE B204358

TRUELINE N710A 300 WOG STAINLESS 2 IN NPT BALL VALVE B218739

NEW DORMONT EMICO YN1 CF8M 1000 STAINLESS 0.5IN 1/2IN NPT BALL VALVE D203243

MAS CF8M 1/4 IN NPT 2000WOG STAINLESS THREADED BALL VALVE B402309

NEW WORCESTER CONTROLS WAFER 3 IN STAINLESS BALL VALVE D482058

NELES JAMESBURY 5150 31 3600TT PNEUMATIC 150 FLANGED 2IN BALL VALVE B256868

NEW FNW 601-150 2-1/2IN FLANGED 150 STEEL BALL VALVE D403483

NEW APOLLO 70-104-01 3/4 IN NPT BRONZE THREADED BALL VALVE D410560

NEW EFFEBI MOON N702N610 WAFER SPHERE STAINLESS 2-1/2 IN BALL VALVE B252462

WORCESTER CONTROLS 11/2CPT4446TBSE THREADED 1-1/2IN NPT BALL VALVE D303861

ITT GRINNELL BRASS THREADED 2IN NPT BALL VALVE D278018

TA CHEN TC-03S 1000 WOG FLOW 3/4 IN STAINLESS SOCKET WELD BALL VALVE B480587

VALPRES PN 40 1 IN NPT PNEUMATIC STAINLESS THREADED BALL VALVE B402241

TRI CLOVER SANITARY DISC BODY CG3M 1 IN STAINLESS FLANGED BALL VALVE B454677

VELAN S08-M1113-SSG VALVAC 1500PSI-WOG STAINLESS THREADED 2IN BALL VALVE B355375

NEW MCCANNA S302-BR-R-S6 BRONZE THREADED 3/4IN NPT BALL VALVE D357368

NEW APOLLO 76-101-01A CF8M 1/4 IN NPT STAINLESS THREADED BALL VALVE D410578