p.1 

OAR Box 1147 

Prepped by Ollie Stewart 

Document Number: 

182) IV-E-55 

Docket Number: 

A-87-11 

Printed 4/22/2008 2:42:57 PM Sheet 182 of 242 
\ UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

P.2 

fr-<37^Jr£ 

TZ - e Sm\ 

ANN ARBOR. MICHIGAN 48105 

% 

OFFICE OF 

AIR AND RADIATION 

JUN I 6 1988 

MEMORANDUM 

SUBJECT: EPA Meetings With Potential Onboard Rollover Vent 

Valve Manufacturers 

FROM: Jean Schwendeman, Mechanical Engineer ^s£rt%^~ yv| • ^ ^ 

Standards Development and Support Branch^/ 

TO: Public Docket A-87-11 

THRU: Glenn W. Passavant, Senior Project Manager 

Standards Development and Support;^ranch 

Chester J. France, Chief -4A 

Standards Development and ^ppo/rl 

Representatives of EPA's Office of Mobile Sources have met 

with several manufacturers of automotive evaporative emission 

control system/rollover valves to discuss potential designs of 

onboard refueling vent valves. All of these manufacturers now 

manufacturer fuel tank rollover valves and each has been 

working with automotive companies on onboard refueling control 

system designs. Each of the manufacturers said they do 100 

percent reliability testing on their current valves as part of 

their production process. A list of the meeting dates and 

attendees is attached. 

The first meeting was held with G.T. Products, which 

manufactures a rollover-vent valve used on Ford light-duty 

trucks. G.T. Products has provided EPA with several of these 

valves. This valve design was modified by EPA and incorporated 

into our most current onboard control system design. 

A meeting was also held with Stant. Stant has proposed a 

fuel fillneck mounted refueling vent valve. The design of this 

valve is shown in the attached handout which Stant presented at 

the meeting. Several pages of the handout are not included in 
P.3 

the attachment because they contain information considered 

confidential by Stant. EPA has not obtained any valves from 

Stant.- Stant also did a field survey of service stations in 

the Connersville, Indiana area where one of their facilities is 

located. They collected data on nozzle diameters and vacuum 

shutoff signals at these stations. The data provided to EPA is 

attached. 

EPA also met with Borg-Warner. Borg-Warner also showed 

EPA a fillneck mounted valve, but provided no further handouts 

or related hardware. 

Attachments 
P.4 

EPA/G.T. Products Meeting 

February 16, 1988 

John Anderson EPA Joseph Newton G.T, 

Glenn Passavant EPA Rudy Bergsma G.T, 

Karen Lostoski EPA 

John Gabrysiak EPA 

Jean Schwendeman EPA 

EPA/Borg Warner Meeting 

February 17, 1988 

John Anderson 

Glenn Passavant 

Jean Schwendeman 

John Gabrysiak 

EPA 

EPA 

EPA 

EPA 

John Aubel Borg Warner 

EPA/Stant Meeting 

March 1, 1988 

John Anderson EPA Robert Harris Stant 

Jean Schwendeman EPA William Johnson Stant 

John Gabrysiak EPA William Thornton Stant 
P.5 

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£V 01378 

STANT DESIGN CRITERIA , 

O.B.V.R. *W * 

1. CUSTOMER SAFETY 

2. NORMAL'OPERATION 

3. IMPROVED FILL FUNCTION 

4. REGULATORY COMPLIANCE 
P.6 

/ . / 

1. CUSTOMER SAFETY 

• PROVISION FOR FAILED NOZZLE SHUT-OFF 

• CONTROLLED BYPASS FLOW 

• LIMITED TANK PRESSURE EXCURSION 

• MINIMAL LIQUID LOSS DURING FAILURE MODE 

NOZZLE REMOVAL 

• NO LIQUID LOSS AT CAP REMOVAL 
P.7 

2. NORMAL OPERATION 

CONVENTIONAL CAP REMOVAL 

SMOOTH LOW EFFORT NOZZLE INSERTION 

NO TRANSITION OR MANIPULATION REQUIRED 

FROM OFF TO FULL FLOW 

WALK-AWAY NOZZLE POSITIONING AND OPERATION 

SMOOTH LOW EFFORT NOZZLE REMOVAL 

DRY NOZZLE AT REMOVAL WITH NORMAL SHUT-OFF 
P.8 

i 

3. IMPROVED FILL FUNCTION 

/ / 

I" 

• ELIMINATE PREMATURE NOZZLE SHUT-OFFS AT 

ALL FILL RATES TO 13 GALLONS/MIN. 

• REDUCE FILL RATE SENSITIVITY TO VOLATILITY OF FUEL 

• INCREASE ACCURACY OFFULL TANK'FILL LIMIT 

• REDUCE POTENTIAL FOR OVERFILL DUE TO MANUAL 

TRICKING OF NOZZLE 

• ELIMINATE'SPIT BACKSDURING FILL OR NOZZLE SHUT-OFI 

• REDUCE TANK OVERFILL DURINGFAILED NOZZLE' 

OR OTHER FAILURE MODES 

« PROVIDE'PLANT FILL'CAPABILITY TO 20 GALLONS/MIN. 
P.9 

4. REGULATORY COMPLIANCE 

TARGET-ZERO LOSS DURING FILL 

• EFFECTIVE NOZZLE SEAL 

• MINIMAL PRESSURE STRESS ON SEAL 

DURING REFUELING 

• ELIMINATE PRESSURE SPIKE 

DURING NOZZLE SHUT-OFF 

PROVIDE COMPLETE INDEPENDENCE FROM 

fHfNttSSS YSTEM 

ALLOW DRAW BACK THROUGH STORAGE SYSTEM DURING 

TANK VACUUM CONDITIONS 

FULL COMPLIANCE WITH'EXTENDED'N.H.T.S.A. GUIDELINES 

VENT RESIDUAL TANK PRESSURE TO STORAGE SYSfEWT 

PRIOR TO REFUELING OPERATIONS 
EXTERNAL VENT 

IORMAL VEHICLE OPERATION 

CLOSURE CAP 

CONTROL DIAPHRAGM PASSAGE 

CONTROL DIAPHRAGM 

(OPEN DURING REFUELING) 

(CLOSED DURING VEHICLP OPERATION) 

PURGE PASSAGE 

(TO CANISTER) 

LENGTH AS REQURED TO CLOSE 

VAPOR FLOW PASSAGE TO CANISTER 

DURING TANK OVERFILL CONDITION 

NOZZLE SEAL 

FLAPPER DOOR 

•ZSmmZ 

•NT PASSAGE 

ROM TANK) 

BY-PASS VALVE 

(PRESSURE RELIEF) 

FUEL DISCRIMINATOR DIAPHRAGM 

FILL PASSAGE 

t NOZZLE SHUT-OFF PASSAGE 

FUEL DISCRIMINATOR DIAPHRAGM PASSAGE 

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P.11 

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Slant CoKrstriO- IU. JnL. ^ 

FIELD SURVEY OF SERVICE STATION NOZZLES 

Nozzle Shut-Off Signal, Vacuum: X= 7.18 kPa <J = 0.958 kPa 

(Full fill rate) 

Nozzle Diameter: X= 0.814 in. or = 0.005 in. 

(SAE Recommendation: 13/16 in (0.8125 to 0.840)) 

Service Station 

Amoco 

OPW 

Shell (1) 

OPW, Husky 

Bonded 

OPW 

United 

OPW, Husky 

Shell (2) 

Husky 

Mobil 

Viking 

Clark 

Emco Wheaton 

Shell (3) 

OPW 

Marathon 

Emco, Husky 

Checker 

OPW 

Vacuum Signal 

(kPa) 

8.25 

9.0 

7.5 

6.5 

7.0 

5.25 

7.5 

7.5 

8.0 

7.0 

7.0 

6.5 

6.0 

7.5 

9.0 

8.0 

5.75 

6.5 

6.25 

7.5 

7.0 

7.5 

Nozzle 

.0.816 

0.813 

0.812 

0.818 

0.813 

0.814 

0.813 

0.813 

0.813 

0.833 

0.828 

0.825 

0.815 

0.813 

0.814 

0.815 

0.813 

0.810 

0.812 

0.810 

0.811 

0.812 

0.817 

0.812 

Diameters 

(in.) 

. 0.815 . 

0.815 

0.815 

0.813 

0.815 

0.815 

0.810 

0.812 

• 0.832 

0.810 

0.808 

0.812 

0.812 

0.810 

0.820 

0.816 

0.811 

0.813 

0.813 

0.812 

0.812 

0.812 

0.815 

0.814 

1 

Note: Each pressure represents three trials for a nozzle. It should 

be noted there was no measurable variation between trials for 

each nozzle. 

No NVck cr*s CM^> °f 4) **

 2

-

7

-'Ci 
14-

13-

12-

11-

10-

9-

8 

7-

6-

5-

4-

3 

2 

1-

Stant 

• 

" " • 

> 

\ 

i 

^04 .806 .808 .810 .812 .814 .816 .818 JQ20 .822 .824 .826.828 .830 .832 .834 .836 

inches 

FREQUENCY DISTRIBUTION OF NOZZLE DIAMETERS 
Stant. 

7-

c -

O 

5* 

A • 

4 

3-

2" 

4 . 

• 1 " 

\ 

• 

\ i 

• 

/ 

i 

i 

• 

4.5 5.0 5^5 6!o 6^5 7.0 7!5 8.0 8^5 9^0 9^5 

kPa 

FREQUENCY DISTRIBUTION OF VACUUM REQUIRED FOR NOZZLE SHUT-OFF.