ERHARD ǀ ERHARD

DN 150 - 1200
PN 10 - 25
Body: EN-GJS-400-15
Coating: outside epoxy, inside enamel

The newest generation of double eccentric butterfly valves with flow-optimized "Wave-design" ensures minimized pressure losses and high energy-efficiency. Polygon connection of shaft and disc provides uninterrupted corrosion protection and optimal torque transmission at the same time. Use of slider crank gearbox allows safe operation of butterfly valves with minimized pressure surges. DIN DVGW type examination certificate for potable water available up to DN1600.

Features

Resilient seated according to EN 593
Face-to-face dimension according to EN 558, basic series 14 (DIN 3202 F4)
Flange connection on both sides according to EN 1092-2
Low headloss, minimized flow restriction and high energy-efficiency
Disc bearing in maintenance-free bushings, sealed by means of O-rings
Polygon-connection of shaft and disc without additional security elements required, closed bearing-eyes for uninterrupted corrosion protection
Optimum corrosion protection body inside (incl. seat) and disc by enamel coating
Optimum corrosion protection body outside by epoxy powder coating according to GSK guidelines
Standard actuation by robust and maintenance-free slider-crank gearbox, protection class IP 68, with integrated position indicator
Modular actuation concept that allows use of hand wheel, electric actuator, extension spindle, hydraulic drop weight actuator, pneumatic actuator or chain wheel

Downloads

Document Type

PBR DBV 200814 ROCO WAVE EN web (1).pdf(pdf 10,87 MB)
PBR ACT160413 ERHARD KFa-Weight Loaded Actuator EN (1).pdf(pdf 5,53 MB)
PBR DBV200803 ROCO WAVE ES.pdf(pdf 4,99 MB)
PBR DBV160530 ROCO WAVE RU.pdf(pdf 8,43 MB)
BA50E133 ROCO WAVE rotary actuator DN150 1600 EN.pdf(pdf 1,03 MB)
BA50S133 ROCO WAVE rotary actuator DN150 1600 ES.pdf(pdf 1,05 MB)
BA50F134 ROCO WAVE without actuator DN150 1600 FR.pdf(pdf 898,90 KB)
BA50F133 ROCO WAVE rotary actuator DN150 1600 FR.pdf(pdf 1,02 MB)
BA50S132 ROCO WAVE hand operated DN150 1600 ES.pdf(pdf 1,018,32 KB)
BA50E132 ROCO WAVE hand operated DN150 1600 EN.pdf(pdf 1,012,09 KB)
BA50E134 ROCO WAVE without actuator DN150 1600 EN.pdf(pdf 916,05 KB)
BA50F132 ROCO WAVE hand operated DN150 1600 FR.pdf(pdf 1,004,29 KB)
DRW3 DBV ROCO Wave DN1000 PN16 SKG HDW.stp(stp 3,69 MB)
DRW3 DBV ROCO Wave DN800 PN10 SKG RS.stp(stp 2,67 MB)
DRW3 DBV ROCO Wave DN600 PN16 SKG HDW.stp(stp 3,40 MB)
DRW3 DBV ROCO Wave DN600 PN16 SKG EA.stp(stp 3,00 MB)
DRW3 DBV ROCO Wave DN600 PN16 SKG RS.stp(stp 2,62 MB)
DRW3 DBV ROCO Wave DN1000 PN16 SKG RS.stp(stp 2,93 MB)
DRW3 DBV ROCO Wave DN1000 PN10 SKG HDW.stp(stp 3,31 MB)
DRW3 DBV ROCO Wave DN800 PN10 SKG HDW.stp(stp 3,45 MB)
DRW3 DBV ROCO Wave DN300 PN16 SKG EA.stp(stp 2,38 MB)
DRW3 DBV ROCO Wave DN500 PN10 SKG RS.stp(stp 2,30 MB)
DRW3 DBV ROCO Wave DN800 PN16 SKG RS.stp(stp 2,75 MB)
DRW3 DBV ROCO Wave DN700 PN16 SKG HDW.stp(stp 3,34 MB)
DRW3 DBV ROCO Wave DN900 PN10 SKG RS.stp(stp 2,62 MB)
DRW3 DBV ROCO Wave DN200 PN10 SKG HDW.stp(stp 2,84 MB)
DRW3 DBV ROCO Wave DN1000 PN16 SKG EA.stp(stp 3,06 MB)
DRW3 DBV ROCO Wave DN900 PN10 SKG EA.stp(stp 3,03 MB)
DRW3 DBV ROCO Wave DN450 PN16 SKG HDW.stp(stp 2,98 MB)
DRW3 DBV ROCO Wave DN700 PN10 SKG EA.stp(stp 2,91 MB)
DRW3 DBV ROCO Wave DN300 PN10 SKG RS.stp(stp 2,31 MB)
DRW3 DBV ROCO Wave DN150 PN16 SKG RS.stp(stp 2,21 MB)
DRW3 DBV ROCO Wave DN500 PN10 SKG EA.stp(stp 2,40 MB)
DRW3 DBV ROCO Wave DN1400 PN10 SKG HDW.stp(stp 3,61 MB)
DRW3 DBV ROCO Wave DN700 PN16 SKG EA.stp(stp 3,02 MB)
DRW3 DBV ROCO Wave DN150 PN10 SKG RS.stp(stp 2,21 MB)
DRW3 DBV ROCO Wave DN400 PN16 SKG HDW.stp(stp 2,87 MB)
DRW3 DBV ROCO Wave DN600 PN10 SKG HDW.stp(stp 2,97 MB)
DRW3 DBV ROCO Wave DN1400 PN16 SKG HDW.stp(stp 4,00 MB)
DRW3 DBV ROCO Wave DN300 PN10 SKG HDW.stp(stp 2,90 MB)
DRW3 DBV ROCO Wave DN700 PN16 SKG RS.stp(stp 2,61 MB)
DRW3 DBV ROCO Wave DN250 PN16 SKG EA.stp(stp 2,29 MB)
DRW3 DBV ROCO Wave DN350 PN16 SKG HDW.stp(stp 2,93 MB)
DRW3 DBV ROCO Wave DN1100 PN10 SKG P4E.stp(stp 2,79 MB)
DRW3 DBV ROCO Wave DN1200 PN16 SKG HDW.stp(stp 3,67 MB)
DRW3 DBV ROCO Wave DN250 PN10 SKG HDW.stp(stp 2,84 MB)
DRW3 DBV ROCO Wave DN450 PN10 SKG EA.stp(stp 2,42 MB)
DRW3 DBV ROCO Wave DN1600 PN16 SKG HDW.stp(stp 3,89 MB)
DRW3 DBV ROCO Wave DN1200 PN10 SKG EA.stp(stp 2,96 MB)
DRW3 DBV ROCO Wave DN250 PN10 SKG RS.stp(stp 2,25 MB)
DRW3 DBV ROCO Wave DN450 PN16 SKG RS.stp(stp 2,35 MB)
DRW3 DBV ROCO Wave DN1000 PN10 SKG EA.stp(stp 3,00 MB)
DRW3 DBV ROCO Wave DN450 PN10 SKG RS.stp(stp 2,32 MB)
DRW3 DBV ROCO Wave DN450 PN16 SKG EA.stp(stp 2,46 MB)
DRW3 DBV ROCO Wave DN1000 PN10 SKG RS.stp(stp 2,58 MB)
DRW3 DBV ROCO Wave DN1200 PN16 SKG EA.stp(stp 3,05 MB)
DRW3 DBV ROCO Wave DN250 PN16 SKG HDW.stp(stp 2,79 MB)
DRW3 DBV ROCO Wave DN800 PN10 SKG EA.stp(stp 3,06 MB)
DRW3 DBV ROCO Wave DN350 PN16 SKG RS.stp(stp 2,31 MB)
DRW3 DBV ROCO Wave DN900 PN10 SKG HDW.stp(stp 3,35 MB)
DRW3 DBV ROCO Wave DN200 PN10 SKG EA.stp(stp 2,34 MB)
DRW3 DBV ROCO Wave DN400 PN10 SKG EA.stp(stp 2,40 MB)
DRW3 DBV ROCO Wave DN700 PN10 SKG HDW.stp(stp 3,30 MB)
DRW3 DBV ROCO Wave DN150 PN10 SKG EA.stp(stp 2,31 MB)
DRW3 DBV ROCO Wave DN1400 PN10 SKG RS.stp(stp 2,85 MB)
DRW3 DBV ROCO Wave DN600 PN10 SKG EA.stp(stp 2,46 MB)
DRW3 DBV ROCO Wave DN900 PN16 SKG RS.stp(stp 2,76 MB)
DRW3 DBV ROCO Wave DN1200 PN10 SKG RS.stp(stp 2,55 MB)
DRW3 DBV ROCO Wave DN1200 PN10 SKG HDW.stp(stp 3,27 MB)
DRW3 DBV ROCO Wave DN600 PN10 SKG RS.stp(stp 2,35 MB)
DRW3 DBV ROCO Wave DN800 PN16 SKG HDW.stp(stp 3,48 MB)
DRW3 DBV ROCO Wave DN150 PN16 SKG HDW.stp(stp 2,80 MB)
DRW3 DBV ROCO Wave DN200 PN16 SKG HDW.stp(stp 2,92 MB)
DRW3 DBV ROCO Wave DN1400 PN16 SKG EA.stp(stp 3,38 MB)
DRW3 DBV ROCO Wave DN1100 PN10 SKG HDW.stp(stp 3,23 MB)
DRW3 DBV ROCO Wave DN1600 PN10 SKG RS.stp(stp 3,09 MB)
DRW3 DBV ROCO Wave DN400 PN16 SKG EA.stp(stp 2,35 MB)
DRW3 DBV ROCO Wave DN450 PN10 SKG HDW.stp(stp 2,94 MB)
DRW3 DBV ROCO Wave DN300 PN16 SKG HDW.stp(stp 2,87 MB)
DRW3 DBV ROCO Wave DN150 PN16 SKG EA.stp(stp 2,31 MB)
DRW3 DBV ROCO Wave DN1400 PN10 SKG EA.stp(stp 2,99 MB)
DRW3 DBV ROCO Wave DN400 PN10 SKG RS.stp(stp 2,30 MB)
DRW3 DBV ROCO Wave DN1600 PN10 SKG EA.stp(stp 3,23 MB)
DRW3 DBV ROCO Wave DN500 PN16 SKG HDW.stp(stp 3,06 MB)
DRW3 DBV ROCO Wave DN300 PN16 SKG RS.stp(stp 2,28 MB)
DRW3 DBV ROCO Wave DN200 PN10 SKG RS.stp(stp 2,24 MB)
DRW3 DBV ROCO Wave DN350 PN10 SKG EA.stp(stp 2,38 MB)
DRW3 DBV ROCO Wave DN1400 PN16 SKG RS.stp(stp 3,24 MB)
DRW3 DBV ROCO Wave DN800 PN16 SKG EA.stp(stp 3,16 MB)
DRW3 DBV ROCO Wave DN350 PN16 SKG EA.stp(stp 2,42 MB)
DRW3 DBV ROCO Wave DN1600 PN16 SKG RS.stp(stp 3,13 MB)
DRW3 DBV ROCO Wave DN1600 PN16 SKG EA.stp(stp 3,27 MB)
DRW3 DBV ROCO Wave DN400 PN16 SKG RS.stp(stp 2,25 MB)
DRW3 DBV ROCO Wave DN250 PN16 SKG RS.stp(stp 2,19 MB)
DRW3 DBV ROCO Wave DN900 PN16 SKG EA.stp(stp 3,17 MB)
DRW3 DBV ROCO Wave DN200 PN16 SKG EA.stp(stp 2,42 MB)
DRW3 DBV ROCO Wave DN500 PN10 SKG HDW.stp(stp 2,92 MB)
DRW3 DBV ROCO Wave DN700 PN10 SKG RS.stp(stp 2,53 MB)
DRW3 DBV ROCO Wave DN1600 PN10 SKG HDW.stp(stp 3,85 MB)
DRW3 DBV ROCO Wave DN200 PN16 SKG RS.stp(stp 2,32 MB)
DRW3 DBV ROCO Wave DN900 PN16 SKG HDW.stp(stp 3,49 MB)
DRW3 DBV ROCO Wave DN350 PN10 SKG HDW.stp(stp 2,87 MB)
DRW3 DBV ROCO Wave DN350 PN10 SKG RS.stp(stp 2,28 MB)
DRW3 DBV ROCO Wave DN300 PN10 SKG EA.stp(stp 2,41 MB)
DRW3 DBV ROCO Wave DN250 PN10 SKG EA.stp(stp 2,35 MB)
DRW3 DBV ROCO Wave DN500 PN16 SKG EA.stp(stp 2,55 MB)
DRW3 DBV ROCO Wave DN500 PN16 SKG RS.stp(stp 2,44 MB)
DRW3 DBV ROCO Wave DN1100 PN10 SKG EA.stp(stp 2,92 MB)
DRW3 DBV ROCO Wave DN400 PN10 SKG HDW.stp(stp 2,92 MB)
DRW3 DBV ROCO Wave DN1200 PN16 SKG RS.stp(stp 2,91 MB)
TDT DBV161019 ROCO Wave EN.rtf(rtf 53,63 KB)
DRW3 DBV ROCO Wave DN500 PN10 SKG RS.igs(igs 3,34 MB)
DRW3 DBV ROCO Wave DN150 PN16 SKG HDW.igs(igs 3,90 MB)
DRW3 DBV ROCO Wave DN1600 PN16 SKG HDW.igs(igs 5,48 MB)
DRW3 DBV ROCO Wave DN200 PN16 SKG RS.igs(igs 3,34 MB)
DRW3 DBV ROCO Wave DN1600 PN10 SKG HDW.igs(igs 5,44 MB)
DRW3 DBV ROCO Wave DN1400 PN10 SKG HDW.igs(igs 5,11 MB)
DRW3 DBV ROCO Wave DN450 PN16 SKG RS.igs(igs 3,41 MB)
DRW3 DBV ROCO Wave DN500 PN10 SKG HDW.igs(igs 4,08 MB)
DRW3 DBV ROCO Wave DN1100 PN10 SKG EA.igs(igs 4,28 MB)
DRW3 DBV ROCO Wave DN800 PN16 SKG RS.igs(igs 3,96 MB)
DRW3 DBV ROCO Wave DN450 PN10 SKG EA.igs(igs 3,53 MB)
DRW3 DBV ROCO Wave DN500 PN10 SKG EA.igs(igs 3,50 MB)
DRW3 DBV ROCO Wave DN400 PN10 SKG EA.igs(igs 3,50 MB)
DRW3 DBV ROCO Wave DN1400 PN16 SKG HDW.igs(igs 5,50 MB)
DRW3 DBV ROCO Wave DN1400 PN10 SKG EA.igs(igs 4,38 MB)
DRW3 DBV ROCO Wave DN400 PN10 SKG RS.igs(igs 3,33 MB)
DRW3 DBV ROCO Wave DN200 PN16 SKG HDW.igs(igs 4,05 MB)
DRW3 DBV ROCO Wave DN1000 PN10 SKG RS.igs(igs 3,75 MB)
DRW3 DBV ROCO Wave DN900 PN10 SKG RS.igs(igs 3,78 MB)
DRW3 DBV ROCO Wave DN600 PN16 SKG RS.igs(igs 3,73 MB)
DRW3 DBV ROCO Wave DN1000 PN10 SKG HDW.igs(igs 4,63 MB)
DRW3 DBV ROCO Wave DN150 PN10 SKG HDW.igs(igs 3,90 MB)
DRW3 DBV ROCO Wave DN1200 PN10 SKG HDW.igs(igs 4,59 MB)
DRW3 DBV ROCO Wave DN800 PN10 SKG RS.igs(igs 3,80 MB)
DRW3 DBV ROCO Wave DN1100 PN10 SKG HDW.igs(igs 4,54 MB)
DRW3 DBV ROCO Wave DN1200 PN16 SKG RS.igs(igs 4,27 MB)
DRW3 DBV ROCO Wave DN150 PN16 SKG RS.igs(igs 3,18 MB)
DRW3 DBV ROCO Wave DN500 PN16 SKG RS.igs(igs 3,54 MB)
DRW3 DBV ROCO Wave DN400 PN16 SKG HDW.igs(igs 4,00 MB)
DRW3 DBV ROCO Wave DN350 PN16 SKG RS.igs(igs 3,35 MB)
DRW3 DBV ROCO Wave DN150 PN10 SKG EA.igs(igs 3,33 MB)
DRW3 DBV ROCO Wave DN1200 PN10 SKG RS.igs(igs 3,71 MB)
DRW3 DBV ROCO Wave DN450 PN16 SKG HDW.igs(igs 4,16 MB)
DRW3 DBV ROCO Wave DN400 PN10 SKG HDW.igs(igs 4,07 MB)
DRW3 DBV ROCO Wave DN600 PN10 SKG HDW.igs(igs 4,13 MB)
DRW3 DBV ROCO Wave DN600 PN10 SKG RS.igs(igs 3,39 MB)
DRW3 DBV ROCO Wave DN1100 PN10 SKG RS.igs(igs 3,66 MB)
DRW3 DBV ROCO Wave DN350 PN16 SKG EA.igs(igs 3,52 MB)
DRW3 DBV ROCO Wave DN300 PN16 SKG HDW.igs(igs 3,98 MB)
DRW3 DBV ROCO Wave DN1000 PN16 SKG HDW.igs(igs 5,18 MB)
DRW3 DBV ROCO Wave DN1000 PN16 SKG EA.igs(igs 4,45 MB)
DRW3 DBV ROCO Wave DN700 PN16 SKG RS.igs(igs 3,78 MB)
DRW3 DBV ROCO Wave DN500 PN16 SKG HDW.igs(igs 4,28 MB)
DRW3 DBV ROCO Wave DN1600 PN16 SKG EA.igs(igs 4,75 MB)
DRW3 DBV ROCO Wave DN600 PN16 SKG HDW.igs(igs 4,66 MB)
DRW3 DBV ROCO Wave DN1600 PN10 SKG EA.igs(igs 4,71 MB)
DRW3 DBV ROCO Wave DN900 PN16 SKG EA.igs(igs 4,61 MB)
DRW3 DBV ROCO Wave DN900 PN16 SKG HDW.igs(igs 4,87 MB)
DRW3 DBV ROCO Wave DN250 PN10 SKG RS.igs(igs 3,26 MB)
DRW3 DBV ROCO Wave DN350 PN16 SKG HDW.igs(igs 4,10 MB)
DRW3 DBV ROCO Wave DN1200 PN16 SKG EA.igs(igs 4,45 MB)
DRW3 DBV ROCO Wave DN250 PN10 SKG EA.igs(igs 3,42 MB)
DRW3 DBV ROCO Wave DN200 PN16 SKG EA.igs(igs 3,50 MB)
DRW3 DBV ROCO Wave DN400 PN16 SKG EA.igs(igs 3,42 MB)
DRW3 DBV ROCO Wave DN200 PN10 SKG HDW.igs(igs 3,94 MB)
DRW3 DBV ROCO Wave DN300 PN16 SKG RS.igs(igs 3,26 MB)
DRW3 DBV ROCO Wave DN1200 PN10 SKG EA.igs(igs 4,33 MB)
DRW3 DBV ROCO Wave DN300 PN10 SKG EA.igs(igs 3,47 MB)
DRW3 DBV ROCO Wave DN300 PN10 SKG RS.igs(igs 3,31 MB)
DRW3 DBV ROCO Wave DN500 PN16 SKG EA.igs(igs 3,70 MB)
DRW3 DBV ROCO Wave DN800 PN10 SKG HDW.igs(igs 4,72 MB)
DRW3 DBV ROCO Wave DN1400 PN16 SKG EA.igs(igs 4,77 MB)
DRW3 DBV ROCO Wave DN600 PN16 SKG EA.igs(igs 4,33 MB)
DRW3 DBV ROCO Wave DN350 PN10 SKG HDW.igs(igs 3,99 MB)
DRW3 DBV ROCO Wave DN900 PN10 SKG HDW.igs(igs 4,66 MB)
DRW3 DBV ROCO Wave DN1000 PN16 SKG RS.igs(igs 4,28 MB)
DRW3 DBV ROCO Wave DN450 PN10 SKG HDW.igs(igs 4,11 MB)
DRW3 DBV ROCO Wave DN700 PN10 SKG HDW.igs(igs 4,54 MB)
DRW3 DBV ROCO Wave DN1400 PN16 SKG RS.igs(igs 4,60 MB)
DRW3 DBV ROCO Wave DN350 PN10 SKG RS.igs(igs 3,27 MB)
DRW3 DBV ROCO Wave DN900 PN16 SKG RS.igs(igs 3,99 MB)
DRW3 DBV ROCO Wave DN150 PN16 SKG EA.igs(igs 3,33 MB)
DRW3 DBV ROCO Wave DN1600 PN10 SKG RS.igs(igs 4,54 MB)
DRW3 DBV ROCO Wave DN300 PN10 SKG HDW.igs(igs 4,02 MB)
DRW3 DBV ROCO Wave DN800 PN10 SKG EA.igs(igs 4,39 MB)
DRW3 DBV ROCO Wave DN200 PN10 SKG EA.igs(igs 3,39 MB)
DRW3 DBV ROCO Wave DN1000 PN10 SKG EA.igs(igs 4,37 MB)
DRW3 DBV ROCO Wave DN800 PN16 SKG HDW.igs(igs 4,84 MB)
DRW3 DBV ROCO Wave DN900 PN10 SKG EA.igs(igs 4,40 MB)
DRW3 DBV ROCO Wave DN150 PN10 SKG RS.igs(igs 3,18 MB)
DRW3 DBV ROCO Wave DN700 PN16 SKG HDW.igs(igs 4,66 MB)
DRW3 DBV ROCO Wave DN600 PN10 SKG EA.igs(igs 3,55 MB)
DRW3 DBV ROCO Wave DN350 PN10 SKG EA.igs(igs 3,43 MB)
DRW3 DBV ROCO Wave DN250 PN10 SKG HDW.igs(igs 3,97 MB)
DRW3 DBV ROCO Wave DN300 PN16 SKG EA.igs(igs 3,43 MB)
DRW3 DBV ROCO Wave DN250 PN16 SKG HDW.igs(igs 3,88 MB)
DRW3 DBV ROCO Wave DN700 PN10 SKG EA.igs(igs 4,21 MB)
DRW3 DBV ROCO Wave DN1400 PN10 SKG RS.igs(igs 4,21 MB)
DRW3 DBV ROCO Wave DN450 PN10 SKG RS.igs(igs 3,37 MB)
DRW3 DBV ROCO Wave DN250 PN16 SKG RS.igs(igs 3,16 MB)
DRW3 DBV ROCO Wave DN1200 PN16 SKG HDW.igs(igs 5,16 MB)
DRW3 DBV ROCO Wave DN200 PN10 SKG RS.igs(igs 3,22 MB)
DRW3 DBV ROCO Wave DN1600 PN16 SKG RS.igs(igs 4,58 MB)
DRW3 DBV ROCO Wave DN700 PN16 SKG EA.igs(igs 4,41 MB)
DRW3 DBV ROCO Wave DN800 PN16 SKG EA.igs(igs 4,58 MB)
DRW3 DBV ROCO Wave DN450 PN16 SKG EA.igs(igs 3,58 MB)
DRW3 DBV ROCO Wave DN700 PN10 SKG RS.igs(igs 3,62 MB)
DRW3 DBV ROCO Wave DN250 PN16 SKG EA.igs(igs 3,33 MB)
CERT DBV200831 ATEX Declaration ROCO Wave.pdf(pdf 775,60 KB)
WRAS Roco Wave Certificate 1512066 bis 12 2020.pdf(pdf 168,75 KB)
DVGW-Absperrklappe-ROCO-ROCO-WAVE-80-1600-10-16-NW-6201CP0434-bis 08-10-2024-eng.pdf(pdf 962,85 KB)
PED-ROCO wave Butterfly Valve-80-1600-16 Cat.I II III-Fluid 2.pdf(pdf 556,53 KB)
PED-ROCO wave Butterfly Valve-200-1600-10 Cat.I II III-Fluid 2.pdf(pdf 549,81 KB)
Declaration of Conformity-MD-Roco-WAVE-EAK-Butterfly Valve-DN80-DN3000.pdf(pdf 569,97 KB)
PED-ROCO wave Butterfly Valve-80-1600-40 Cat.I II III-Fluid 2.pdf(pdf 558,96 KB)
PED-ROCO wave Butterfly Valve-80-1600-25 Cat.I II III-Fluid 2.pdf(pdf 552,18 KB)

ERHARD
ROCO Wave - outside epoxy - inside and disc in enamel

Features

Downloads

ADDRESS

QUICK ACCESS

ERHARDROCO Wave - outside epoxy - inside and disc in enamel

Features

Downloads

ADDRESS

QUICK ACCESS

ERHARD
ROCO Wave - outside epoxy - inside and disc in enamel