Pressure and vacuum relief Valves

Emission control and safety equipment, for low pressure storage tanks
 DESCRIPTION The venting valve keeps the tank
closed, relieving the pressure
and vacuum when:
Its main function is to control outbreathing and
inbreath of the atmospheric or semi-pressurized
storage tanks, getting as the main benefit, the A) There is product load (filling)
control of emissions into the atmosphere, this into the tank or evaporation by
will generate savings, environmental protection, solar radiation; in these cases,
and tank operational safety. vapors and/or gasses generated
must be expelled in a controlled
The day-to-day operation of the storage tanks way to prevent overpressure.
makes it mandatory to have venting regulation
devices, because in absence of such devices,
B) There is product discharge
product vapors could be emitted into the
(emptying) or condensation due
atmosphere, which besides leading to excessive to low outdoor temperature and
spending and waste, it pollutes the air with the existing vacuum must be
gasses that may damage our health, in addition compensated by the controlled
to represent a fire hazard of the organization. admission of air from outside.
The design, manufacture and characteristics of the
valves meets the guidelines issued by international
standards: API 2000 seventh edition, and ISO
28300, this all concerning standard venting in
atmospheric storage tanks.

Likewise local standards conceived to specify,

service and test these devices issued by chemical
and petrochemical plants are met.

The protection of a storage tank is the combination

of a relief valve mounted on a flame arrester, this
assembly is called venting equipment.
 Series 56
Pipe away vent valve

Series 55
Different to series 55 that freely vents vapors
to the atmosphere, series 56 (also called Pipe
away vent valve) has a chamber and a
discharge with a flanged type connection,
that can be connected to a collection pipe to
Vent valve send these vapors into a further processing,
like confinement, incineration or recovery.
to the atmosphere All the other features are identical to series 55
Series 57
Directed vacuum and
atmospheric vent valve
Whenever due to process requirement or stored liquid
incompatibility is not convenient to permit air entry to
the tank to compensate vacuum, series 57 allows an
injection of a different gas through a connection in
the valve´s vacuum chamber that isolates air inlet.
There is a variant of this series that combines the
discharge chamber of series 56 to achieve more
sophisticated emissions control systems.

All other features are identical to series 55.

 Series 58 comprises a full blanketing system combining
series 57 and 55 valves to achieve a controlled injection
of a seal or blanketing gas (nitrogen, carbon dioxide,
natural gas) with two main objectives.

Avoid air contact with the product contained in the

1) tank with the purpose of preventing deterioration or
changes thereof for pollution or reaction with oxygen.

Injecting gas in a controlled manner will move and

eliminates the air inside the tank and therefore the
2) oxygen that in combination with an energy source may
generate a combustion. if it is not controlled, it could
end in an internal explosion that will damage the tank.

The combination of valves series 55 shall provide the

system with a coordinated and trustable relieve. In case
of failure on the injection valve or lack of seal gas
supply, this shall avoid a possible risk to the tank.

The system should include a regulator and all the

Series 58 necessary accessories for the proper operation of these

units. If you need help with the design of this system,
contact our engineering department for a customized
solution.
Blanketing systems
All other features are identical to series 55.
 Series 59
Vacuum breaker valve.
In some cases the protection against vacuum
generation within a container is required without a
pressure relieve, for this application series 59
(vacuum breaker valve) permits just to have an air
controlled access to a predefined adjustment
point, this valve generally works together or as
backup to a series 55 valve and can also have a
piped vacuum connection similar to the one of
series 57.

All other features are identical to series 55.

SPECIFICATIONS Diaphragm:
Floating-type FEP (Teflon).

Body materials: Flow Capacity Test:

Aluminum, carbon and stainless steel 316. Certified flow capacity by an accredited flow laboratory
issued by the Mexican Accreditation Entity (ema) , with
international traceability recognition agreement (ILAC),
Internal Materials: for pressure and for vacuum, in accordance with ISO
Pressure trim and vacuum trim stainless steel 316
28300, API2000 Seventh edition.
(plate, support, screws, bolts, nuts, guides and
pressure screen).

Nominal Connection Size:

2”, 3”, 4”, 6”, 8”, 10” and 12” diameter.

Connections:
ANSI/ ASA flanges 150#, flat face type (FF) for
aluminum valves, raised face (RF) for steel valves.
(Other options available)

Standard Setpoint Weight loaded:

Standard of 1/2 oz/sq inch up to 2.32 oz/sq inch,
both in pressure as well as in vacuum.

Spring Loaded :
Higher than 2.32 oz/sq inch and up to 15 Psi.
Maximum Leak Rate Test:
Maximum leak rate 1 SCFH; at 90% of set point for all
sizes. Exceeds the ISO28300 – API 2000 requirement.
All valves will include this test report.

Coating:
High-solids polyurethane for marine environment
meets ISO 12944. Other methods upon request.

Operation Test:
Pressure and vacuum setpoint test to meet ISO28300
– API 2000 standards. Each valve will include a test
report with a graphic chart for Pressure/ vacuum, and
leak rate test. All testing procedures are made on a
certified test bench with an international traceability
recognition agreement (ILAC).
Packing:
Includes protection for international transportation
and storage.

Certification:
Certified ISO 9001:2015 Quality Management System
for designing, manufacturing, service and testing by
international IQNet.
 Dimension Approximate weight

A B C
Connection
Aluminum Steel
Size

2” 13 1/2” 10 1/4” 9 3/8” 7.5 kg 20 kg

(50.8mm) (342.90mm) (260.35mm) (238.13mm) (16.5 lbs) (44 lbs)

3” 16 3/8” 11 1/2” 10 7/8” 12 kg 25 kg

(76.2mm) (415.92mm) (292.10mm) (276.23mm) (26.5 lbs) (55 lbs)

4” 19 1/8” 12 3/4” 12 1/2” 20 kg 37 kg

(101.6mm) (485.78mm) (323.85mm) (317.50mm) (44 lbs) (81.5 lbs)

6” 25 1/8” 16” 16 1/2” 29kg 58 kg

(152.4mm) (638.18mm) (406.40mm) (419.10mm) (63.9 lbs) (127.8 lbs)

8” 32 3/16” 19 5/8” 20 3/16” 47 kg 104 kg

(203.2mm) (817.57mm) (498.47mm) (512.77mm) (103.5 lbs) (229 lbs)

10” 36” 20 5/32” 22 1/2” 62 kg 126 kg

(254mm) (914.40mm) (511.96mm) (571.50mm) (136.6 lbs) (277.5 lbs)

12” 40 1/2” 21” 25 1/8” 75 kg 169 kg

(304.8mm) (1028.70mm) (533.40mm) (638.17mm) (165.2 lbs) (372.2 lbs)

Dimensions s-55
 Dimension Approximate weight

Connection Size
A B C D Aluminum Steel

2” x 3” 6” 6 9/16” 12 1/8” 14 7/8” 13 kg 30 kg

(50.8mm x 76.2mm) (152.40mm) (166.69mm) (307.98mm) (377.83mm) (28.6 lbs) (66 lbs)

3” x 4” 6 1/2” 7 9/16” 13 5/8” 17 3/8” 18 kg 43 kg

(76.2mm x 101.6mm) (165.20mm) (192.09mm) (346.08mm) (441.32mm) (39.6 lbs) (94.7 lbs)

4” x 6” 7 1/8” 9 9/16” 16 3/4” 20 1/4” 29 kg 61 kg

(101.6mm x 152.4mm) (180.97mm) (242.89mm) (425.25mm) (511.18mm) (63.9 lbs) (134.3 lbs)

6” x 8” 9 1/8” 12 3/16” 20 3/4” 26” 42kg 115kg

(152.4mm x 203.2mm) (231.78mm) (309.56mm) (527.05mm) (660.40mm) (92.6 lbs) (253.3 lbs)

8” x 10” 11” 15 9/16” 26” 33 1/8” 60 kg 148 kg

(203.2mm x 254mm) (279.40mm) (395.27mm) (660.40mm) (841.38mm) (103.5 lbs) (326 lbs)

10” x 12” 12.000 17.000 28.875 36.750 71 kg 193 kg

(254mm x 304.8mm) (304.80mm) (431.79mm) (73.43mm) (933.45mm) (156.4 lbs) (425.1 lbs)

12” x 14” 15.500” 18.313” 32.000 43.375 101 kg 264 kg

(304.8mm x 355.6mm) (393.70mm) (812.80mm) (812.80mm) (1101.73mm) (222.4 lbs) (581.5 lbs)

Dimensions
s-56
 Dimension Approximate weight

Connection
Size A B C Aluminum Steel

2” 13 3/4” 15 3/4” 9 3/8” 9.5 kg 22 kg

(50.8mm) (349.25mm) (400.05mm) (238.13mm) (20.9 lbs) (48.5 lbs)

3” 16 3/8” 16 3/8” 10 7/8” 14 kg 25 kg

(76.2mm) (415.92mm) (415.68mm) (276.23mm) (30.9 lbs) (59.5 lbs)

4” 19 1/8” 17 5/8” 12 1/2” 22 kg 39 kg

(101.6mm) (485.78mm) (447.68mm) (317.50mm) (48.5 lbs) (86 lbs)

6” 25 1/8” 20 7/8” 16 1/2” 31 kg 60 kg

(152.4mm) (638.18mm) (530.23mm) (419.10mm) (68.3 lbs) (132.3 lbs)

8” 32 3/16” 23 1/8” 20 3/16” 49 kg 106 kg

(203.2mm) (817.55mm) (587.37mm) (512.75mm) (103.6 lbs) (233.7 lbs)

10” 36” 23 5/8” 22 1/2” 64 kg 128 kg

(254mm) (914.40mm) (600.07mm) (571.50mm) (141 lbs) (282.2 lbs)

12” 40 1/2” 24 3/8” 25 1/8” 77 kg 171 kg

(304.8mm) (1028.70mm) (619.12mm) (638.18mm) (169.8 lbs) (377 lbs)

Dimensions s-57
 Dimension

Connection Size
A B C D
2” 21 1/2” 31 5/8” 13 1/2” 9 3/8”
(50.8 mm) (546.10mm) (803.28mm) (342.90mm) (238.13mm)

Backup Unit Injection Equipment

Dimensions s-58
 Dimension Approximate weight

Connection
Size A B C Aluminium Steel

2” 11 7/8” 6 1/2” 6 1/4” 6 kg 18 kg

(50.8mm) (301.63mm) (165.10mm) (158.75mm) (13.2 lbs) (39.7 lbs)

3” 14 5/8” 7 1/8” 7 3/4” 9 kg 22 kg

(76.2mm) (371.48mm) (180.98mm) (196.85mm) (19.8 lbs) (48.5 lbs)

4” 17 3/8” 8 5/8” 9” 16 kg 33 kg
(101.6mm) (441.33mm) (219.08mm) (228.60mm) (35.27 lbs) (72.75 lbs)

6” 22 3/8” 10 3/8” 12 1/4” 24 kg 53 kg

(152.4mm) (568.32mm) (263.53mm) (311.15mm) (52.2 lbs) (116.84 lbs)

8” 28 7/8” 13 3/16” 16 1/4” 41 kg 98 kg

(203.2mm) (733.43mm) (334.95mm) (412.75mm) (90.4 lbs) (216 lbs)

10” 32 7/8” 14 1/8” 18 1/2” 55 kg 119 kg

(254mm) (831.85mm) (358.76mm) (469.90mm) (121.3 lbs) (262.4 lbs)

12” 37 3/8” 15” 20 3/4” 68 kg 161 kg

(304.8mm) (949.33mm) (381.00mm) (527.05mm) (150 lbs) (354 lbs)

Dimensions s-59
 1) Connection diameter

Series 55 Series 56 Series 57 Series 58 Series 55

Model
02
03
2”
3”
2” x 3”
3” x 4”
2”
3”
2”
3”
2”
3” Selection
04 4” 4” x 6” 4” 4” 4”
06 6” 6” x 8” 6” 6” 6” Ordering Example:
08 8” 8” x 10” 8” 8” 8” 55-02-01-09-03-00
10 10” 10” x 12” 10” 10” 10”
Refers to a series 55 free vent valve,
12 12” 12” x 14” 12” 12” 12” 2” diameter connection, aluminum
body and 316 stainless steel internal
2) Body Material materials, Teflon ( FEP) diaphragm.
Set for ½ ounce per square inch
01 356 type aluminum
(STD) pressure – vacuum .
05 Carbon steel
06 Polypropylene
09 316 Stainless Steel

3) Inside materials 5) Calibration type

06 Polypropylene Calibration by specific weight (STD)

00 (0.5 up to 2.3 oz/ inch2) .
09 316 Stainless Steel
Spring loaded for high calibration
01 (Higher than 2.3 oz/sq inch up to 15 PSI)
4) Diaphragm

03 Teflon Special options

 List of Materials

Schematic view Quantity Description

series 55
01 1 piece Valve Body
02 1 piece Vacuum lid
03 1 piece Vacuum seat
04 1 piece Pressure seat
For part selection, indicate 1 piece
05 Pressure guide
model followed by a diagonal *1 piece
06 Pressure gasket
plus the respective part *1 piece
07 Vacuum gasket
number. *1 piece Vacuum lid gasket
08
09 1 piece Pressure screen
* Indicates parts from service 1 piece Vacuum screen
10
kit 1 piece
11 Pressure guide bolt
12 1 piece Pressure plate
13 1 piece Pressure plate support
14 *1 piece Diaphragm for pressure plate
15 1 lot 2 hex nuts f/vacuum plate
16 1 lot 2 flat washers for pressure plate
17 1 piece Vacuum guide bolt
18 1 piece Vacuum plate
19 1 piece Support for vacuum plate
20 *1 piece Diaphragm for vacuum plate
21 1 lot 2 hex nuts f/vacuum plate
22 1 lot 2 flat washers f/vacuum plate
23 1 piece Protective hood
24 1 lot 2 Hood support bolts
25 1 lot 2 Guide support bolts
26 1 lot 4 Cap nuts
27 1 lot 4 Flat washers for hood
28 1 lot 8 Hex head bolts
29 1 lot 12 hex nuts f/support
30 1 lot 8 flat washers for vacuum lid
31 1 piece Identification plate
32 1 lot 2 Pop rivets
 List of Materials

Schematic view 01
Quantity
1 piece
Description
Valve Body

series 56 02
03
04
1 piece
1 piece
1 piece
Vacuum lid
Vacuum seat
Pressure seat
For part selection, indicate 05 1 piece Pressure chamber
model followed by a diagonal 06 1 piece Pressure gasket
plus the respective part 07 *1 piece Pressure lid gasket
number. 08 *1 piece Pressure seat gasket
09 *1 piece Vacuum seat gasket
* Indicates parts from service 10 *1 piece Pressure gasket
kit 11 *1 piece Vacuum lid gasket
12 1 piece Vacuum screen
13 1 piece Pressure guide pin
14 1 piece Pressure plate
15 1 piece Pressure plate holder
16 *1 piece Diaphragm for pressure plate
17 1 lot 2 flat washers pressure plate
18 1 lot 2 hex nut pressure plate
19 1 piece Vacuum guide bolt
20 1 piece Vacuum plate
21 1 piece Support for vacuum plate
22 *1 piece Diaphragm for vacuum plate
23 1 lot 4 hex nuts f/vacuum plate
24 1 lot 4 Flat washers f/vacuum plate
25 1 lot 4 flat washers for pressure cap
26 1 lot 4 Hex bolts for pressure cap
27 1 lot 4 Flat washers for vacuum lid
28 1 lot 4 Hex bolts for pressure seat
29 1 lot 4 Allen bolts pressure seat
30 1 piece Identification plate
31 1 lot 2 Pop rivets
 Quantity Description
01 1 piece Valve Body
02 1 piece Vacuum lid

Schematic view 03
04
1 piece
1 piece
Vacuum seat
Pressure seat

series 57 05
06
07
1 piece
*1 piece
*1 piece
Pressure guide
Pressure gasket
Vacuum gasket
For part selection, indicate 08 *1 piece Vacuum lid gasket
model followed by a diagonal 09 1 piece Pressure screen
plus the respective part 10 1 piece Vacuum screen
number. 11 1 piece Pressure guide bolt
12 1 piece Pressure plate
* Indicates parts from service 13 1 piece Pressure plate holder
kit 14 *1 piece Diaphragm for pressure plate

List of Materials
15 1 lot 2 hex nuts f/vacuum plate
16 1 lot 2 flat washer f/pressure plate
17 1 piece Vacuum guide bolt
18 1 piece Vacuum plate
19 1 piece Support for vacuum plate
20 *1 piece Diaphragm for vacuum plate
21 1 lot 2 hex nuts f/vacuum plate
22 1 lot 2 Flat washers f/vacuum plate
23 1 piece Protective hood
24 1 lot 2 Hood support bolts
25 1 lot 2 Guide support bolts
26 1 lot 4 cap nuts
27 1 lot 4 Flat washers for hood
28 1 lot 8 Hex head bolts
29 1 lot 12 hex nuts f/support
30 1 lot 8 flat washers for vacuum lid
31 1 piece Identification plate
32 1 lot 2 Pop rivets
33 1 lot 12 hex nuts f/support
34 1 lot 8 flat washers for vacuum lid
35 1 piece Identification plate
 Quantity Description
01
02
1 piece
1 piece
Valve Body
Vacuum lid
Schematic view series 58
03 1 piece Vaccum seat For part selection, indicate model
followed by a diagonal plus the
04 1 piece Pressure seat
respective part number.
05 1 piece Pressure guide
06 *1 piece Pressure gasket * Indicates parts from service kit
07 *1 piece Vacuum gasket
08 *1 piece Vacuum lid gasket
Quantity Description
09 1 piece Pressure screen
29 12 pieces Hex nut for support
10 1 piece Straight string nipple 30 4 pieces Flat washer for lid
11 1 piece Pressure guide bolt 31 4 pieces Allen screw
12 1 piece Pressure plate
32 1 piece Elbow
13 1 piece Pressure plate holder 33 1 piece Bushing reduction
14 *1 piece Diaphragm for pressure plate
34 2 pieces Arrester cup
15 2 pieces Hex nuts f/pressure plate
35 1 piece Arrester body
16 2 pieces Flat washer f/pressure plate
36 1 piece Flame cell
17 1 piece Vacuum guide bolt 37 2 pieces Gasket
18 1 piece Vacuum plate
38 1 piece Flat sheet
19 1 piece Support for vacuum plate
39 1 piece Corrugated sheet
20 *1 piece Diaphragm for vacuum plate
40 1 piece Cup bolt
21 2 pieces Hex nut f/vacuum plate
41 3 pieces Studs
22 2 pieces Flat washer f/vacuum plate
42 6 pieces Hex nut
23 1 piece Protective hood
43 1 piece Gasket
24 2 pieces Hood support bolt 44 2 pieces Short hex head screw
25 2 pieces Guide support bolt
45 2 pieces Hex head screw
26 4 pieces Cap nut
46 2 pieces Hex nut
27 4 pieces Flat washer for hood 47 2 pieces pieces Identification plate
28 4 pieces Hex head screw 48 4 pieces Pop rivet
 For part selection, indicate model

Schematic view followed by a diagonal plus the

respective part number.

series 59 * Indicates parts from service kit

Cantidad Descripción
01 1 piece Valve Body
02 1 piece Vacuum lid
03 1 piece Vacuum seat
04 1 piece Pressure lid
05 *1 piece Pressure gasket
06 *1 piece Vacuum gasket
07 *1 piece Vacuum lid gasket
08 1 piece Vacuum screen
09 1 piece Vacuum guide bolt
10 1 piece Vacuum plate
11 1 piece Support for vacuum plate
12 *1 piece Diaphragm for vacuum plate
13 1 lot 2 hex nuts f/vacuum plate
14 1 lot 2 flat washers f/vacuum plate
15 1 lot 12 Hex head screws
16 1 lot Flat washer f/vacuum lid
17 1 piece Identification plate
18 1 lot Pop rivet
 Flow
chart
14.7 PSI. Air standard (scfh)
Thousands cubic feet /hour at 60º
OUNCES / SQ INCHES OUNCES / SQ INCHES

WATER INCHES WATER INCHES

VACUUM PRESSURE
 Additional value for maximum control emissions
Maximum Nominal Flow
110

Warranted Full Opening Leak rate less than 1

100
SCFH at 90% of setpoint
Beginning of Opening
90

80 Protectotank uses a floating seal

system that meets and exceeds
Setpoint %

standards API 2000 / ISO28300;

60 each valve will include a test
report certifying do not exceed
vapor emission in excess of 1
cubic foot per hour, when the
40 internal tank pressure is up to
90% of the set point.

20

0
Environmental emissions control
Protectotank make possible savings in vapor emissions into
the atmosphere which cause pollution and increase risks; this
contributes into economical saving, increased safety in the
operation of the tanks and reduces fire hazards.

The benefits and purpose of a venting equipment are:

Protection:
Against overpressure and overvacuum in the tank

Control:
Eliminate Free vapor exhaust.

Protection to the contained liquid:

The tank remains closed most of the time.

Financial Benefit:
Prevents constant product losses by evaporation.

Safety:
The permanent existence of a highly flammable vapor cloud.

Environment:
Stops the continuous emission of vapors to the atmosphere.
Our facilities meets ISO 17025 international standard
“General requirements for the competence of testing
and calibration laboratories” our test laboratories have
been accredited by the Mexican accreditation entity
(ema) for low pressure and vacuum valves pressure and
flow testing , all valves we produce include a test report
with legal validity through international traceability
recognition agreement (ILAC).

ACCREDITED TEST
LABORATORY
 Maintenance, refurbish and
adjustment services

Protectotank offer maintenance, refurbish and

adjustment services through our rep network.
there are also available service kits and technical
support directly form factory.
 Experience
additional value
Protectotank have been in the market for over 25
years maintaining a constant innovation attitude,
that continuously applies improvements to the
products. Protectotank began to export in 2001
having customers in all America and some other
countries around the world.

The facilities include the best in class CNC

machinery and automated systems, accredited
test benches and certified quality systems to
meet the most demanding standards and all the
customer requirements.

The engineering department may offer you a

customized solution for all your applications
with an affordable price and delivery time.
 Certifications

Clean Industry SIGE IQ Net

Central Laboratory Mobile Laboratory Lesser

 Product warranty
Protectotank warrants that products that are manufactured
by Seller are manufactured in accordance with published
specifications and free from defects in materials and / or
workmanship for a period of (12) twelve months. Seller, at its
option, will repair or replace any products returned intact to
the factory, transportation charges prepaid, which Seller,
upon inspection, could determine to be defective in material
and / or workmanship. The foregoing shall constitute the
sole remedy for any breach of Seller’s warranty.

Protectotank shall be solely responsible for the design,

development, supply, production, and performance of its
products hereunder, and the protection of its trade name or
names, if any. It assumes no responsibility, for products
modified or changed by its agent or customer, or any other
third party. Any such modifications or changes to products
sold by Seller hereunder shall make the product limited
warranty null and void.
 Protectotank SA de CV
www.protectotank.com.mx

Prolongación Industria Textil No. 13,

Col. Parque Industrial Naucalpan, Naucalpan
Estado de Mexico 5348
Phone: 52 55 53 01 12 95