Dixon EHSC Series, HSC Series Instruction & Operation Manual
Instruction & Operation Manual
for
HSC and EHSC Series Spring
Check Valves
Read and understand this manual prior to
installing, operating or servicing this equipment.
Effective Date
June 2019
2 dixonvalve.com • 800.789.1718 HSC & EHSC | IOM
Table of Contents
Safety ......................................................................................................................................................................... 3-4
Care of Stainless Steel ....................................................................................................................................................... ...5
Technical Specifications ..................................................................................................................................................... 6-7
Installation and Start-Up ..................................................................................................................................................... 8-9
Unpacking .................................................................................................................................................................... …8
Tools Needed ............................................................................................................................................................... …8
Welding ........................................................................................................................................................................ …8
Function Testing ......................................................................................................................................................................... …9
Orientation ................................................................................................................................................................... …9
Cleaning ............................................................................................................................................................................. ..10
General Maintenance ......................................................................................................................................................... ..11
Maintenance Intervals ................................................................................................................................................. ..11
Lubrication ................................................................................................................................................................... ..11
Inspection .................................................................................................................................................................... ..12
Cleaning ....................................................................................................................................................................... ..12
Assembly and Disassembly………………………………………………………………………………………………………13-15
Repair Kits……………………………………………………………………………………………………………………………...16
Bill of Materials……………………………………………………………………………………………………………………..17-22
Dimensions……………………………………………………………………………………………………………………………..23
Model Numbers and Part Numbers………………………………………………………………………………………………….24
Troubleshooting………………………………………………………………………………………………………………………..25
Certifications……………………………………………………………………………………………………………………………26
Warranty. ............................................................................................................................................................................ ...27
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Safety Information
The following DANGER, WARNING and CAUTION signs are contained in this manual. To avoid serious injury and/or possible
damage to equipment, pay attention to these messages. Hazards or unsafe practices could result in severe personal injury or death.
DANGER is used in the most extreme cases.
Hazards or unsafe practices which could result in minor or moderate injury. May also be used to alert
against an unsafe operating or maintenance practice.
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
Safety logos, which appear throughout this manual, are used as a reminder that the user should carefully
review for the appropriateness of the product for the media, application and environment in which it will be
used.
Use only replacement parts and devices recommended by the manufacturer to maintain the integrity of the equipment. Make sure
the parts are properly matched to the series, model, serial number and revision level of the equipment.
Safety labels are placed on equipment where appropriate. Do not remove any labeling from any piece of equipment. Replace any
label that is missing.
DO NOT modify any Dixon Sanitary product. Non-factory modifications could create hazardous conditions and void all warranties. DO
NOT attempt to use a Dixon Sanitary product in any application that exceeds the product rating.
General Guidelines
• The owner must comply exclusively with these operating instructions and the authorized use of this piece of equipment. Should
problems arise that cannot be solved using these operating instructions, please contact Dixon® – Sanitary Division. We will be
happy to provide further assistance.
• If any modification work is performed on the product by the owner themselves, Dixon® shall no longer be considered the
manufacturer of the device. In such cases, all components must be subjected to a new certification process for any applicable
certifications that the equipment holds. Unless agreed to in writing by Dixon®, liability, warranties and guarantees shall immediately
be deemed null and void as soon as you:
o Perform modifications/conversion work on the product.
o Use the product for unauthorized purposes.
o Remove or disable safety elements.
o Process products whose material, form and size do not correspond exactly to the description provided.
o Make alterations to the original state of the device.
• The operating instructions are regarded as part of the valve.
• The operating and maintenance personnel must always be able to access the operating instructions.
• The safety instructions provided in the operating instructions must be observed.
• The operating instructions shall be valid for the entirety of the device's lifespan.
• The operating instructions must be maintained and updated as necessary.
• The operating instructions must be passed on to any subsequent owners or operators of the device.
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Safety Information
Owner Must Ensure
• The product is only used as authorized.
• The product is only used when it is in fault-free, fully functional condition, and that the safety equipment is regularly checked
to ensure that it is fully functional.
• The product is only operated, maintained and repaired by personnel with the appropriate qualifications and authorization.
• Checks are made before the product is put into operation to ensure that only the authorized person is in the work area, and no
one is in danger of being injured if the product is in operation.
• The product is checked for visual damage prior to commissioning to ensure that it is only operated when free of faults.
• Any defects are reported immediately to the appropriate supervisor.
• All safety and warning notices attached to the equipment are legible and none are removed.
• The operating instructions are always kept close to the product operation site, in a legible and complete state.
• Personnel are regularly instructed on all occupational safety and environmental protection issues, and are familiar with and
observe the operating instructions, especially the safety instructions contained herein.
• Personnel are trained and supervised to ensure that they follow safety measures, including the obligatory use of
personal protective equipment.
• The product is only connected to pipelines that are depressurized at the time of connection.
• There is no tensile or compressive stress acting on the product connections.
• There is no residual risk at any point where high pressure could occur. High pressure can cause sudden failure in or damage to
the lines and connections.
• Warning notices in the documentation for supplier modules are observed and integrated into the risk assessments in the
workplace.
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Care of Stainless Steel
The stainless-steel components in Dixon Sanitary equipment are machined, welded and assembled by skilled craftsmen using
manufacturing methods that preserve the corrosion-resistant quality of the stainless steel. Retention of corrosion-resistant qualities
under processing conditions requires regular attention to the precautions listed below.
1. Regularly check all electrical devices connected to the equipment for stray currents caused by improper
grounding, damaged insulation or other defects. Corrosion: Pitting often occurs when stray currents
encounter moist stainless steel.
2. Never leave rubber mats, fittings, wrenches, etc. in contact with stainless steel. Corrosion: Pitting or galvanic action. Objects
retard complete drying, preventing air from reforming the protective oxide film. Galvanic corrosion occurs when two dissimilar
metals touch when wet.
3. Immediately rinse equipment after use with warm water until the rinse water is clear. Clean the equipment (manual or CIP)
as soon as possible after rinsing. Corrosion: discoloration, deposits, pitting. Product deposits often cause pitting beneath the
particles.
4. Use only recommended cleaning compounds. Purchase chemicals from reputable and responsible chemical
manufacturers familiar with stainless-steel processing equipment they continuously check the effects of their products on
stainless steel.
5. Use cleaning chemicals exactly as specified by the manufacturer. Do not use excessive concentrations, temperatures or
exposure times. Corrosion: Pitting, discoloration, stress cracks. Permanent damage often occurs from excessive chemical
concentrations, temperatures or exposure times.
6. For manual cleaning, use only soft non-metallic brushes, sponges or pads. Brush with the grain on polished surfaces to avoid
scratching the surface. Corrosion: Pitting, scratches. Metal brushes or sponges will scratch the surface and promote corrosion
over a period of time. Metal particles allowed to remain on a stainless-steel surface will cause pitting.
7. Use chemical bactericides exactly as prescribed by the chemical manufacturer in concurrence with the local health authority.
Use the lowest permissible concentration, temperature and exposure time possible. Flush immediately after bacterial treatment.
In no case should the solution be in contact with stainless-steel for more than 20 minutes. Corrosion: Protective film destroyed.
Chlorine and other halogen bactericides can destroy the protective film. A few degrees increase in temperature greatly increases
chemical activity and accelerates corrosion.
8. Regularly inspect the joints in pipelines. Be sure all connections are tight fitting without binding. Corrosion: Crevice corrosion.
Small crevices caused by improperly seated gaskets will promote crevice corrosion. Stainless steel under stress will develop
stress cracking, especially in the presence of bactericides containing chlorine.
9. Regularly inspect equipment for surface corrosion (i.e. pitting deposits, stress cracks, etc.). If deposit or color corrosion is
detected, remove it immediately using mild scouring powder and detergents. Rinse thoroughly and allow to air dry. Review
production and cleaning procedures to determine the cause. Note: If corrosion is not removed, the protective film cannot be
restored, and corrosion will continue at an accelerated rate.
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Technical Specifications
Materials of Construction Technical Data
• product contact components: 316L stainless steel
• non-product contact components: CF8
Sealing Materials Technical Data
• product contact components: FKM or EPDM
Line Pressure Technical Data
• max product line pressure: 145 PSI (10 bar)
Product Temperature Technical Data
• max operating temperature: 200°F (93°C)
• minimum operating temperature: 15°F (-9°C)
Surface Finish Technical Data
• product contact components: Ra ≤ 32
• others available upon request
Connections
• clamp
• weld
• others available upon request
Seal Types
• EPDM
• FKM
Cleaning Method
• CIP – models: HSC & EHSC sizes: 1 inch – 4 inch
• COP – models: HSC & EHSC sizes: 0.5 inch – 0.75 inch
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Pressure Drop Charts
HSC & EHSC Series Spring Check Valves
0
10
20
30
40
50
60
0 2 4 6 8 10 12 14 16 18
PRESSURE DROP (PSI)
FLOW RATE (GPM)
0.5 inch - 0.75 inch
0.75"
0.50"
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500
PRESSURE DROP (PSI)
FLOW RATE (GPM)
1 inch - 4 inch
3.0"
1.0"
1.5"
2.0"
4.0"
2.5"
8 dixonvalve.com • 800.789.1718 HSC & EHSC | IOM
Installation & Start-Up
The following should be performed upon receiving the product and prior to installation and use of the product. It is important that all
the following processes and procedures are carefully followed and adhered to. Dixon® is not responsible for any damage that
occurs during the unpacking or installation process.
Unpacking
Carefully unpack all the parts and inspect each part for any damage that may have occurred during shipment. Report any damage to
the carrier immediately. The ports on the valve are protected with a plastic cover. If any covers are missing or damaged, inspect the
ports on the valve thoroughly for any damage. Certificates and additional information for the valve can be found at dixonvalve.com.
Please add any necessary paperwork to the plant maintenance files for future use and reference.
Tools Needed
The following tools may be required for any maintenance of the product:
• O-ring pick
• screwdriver
Welding
• For equipment delivered with weld end connections, any rubber or plastic components MUST be removed from the equipment
prior to welding. (See assembly instructions for proper removal of such components.)
• Follow all necessary safety precautions, check lists and standard procedures prior to performing any welding on the equipment.
• Weld the equipment into the process line, being sure to follow and comply with appropriate industry welding procedures and
standards. For equipment used in food, beverage or dairy applications that carries 3A® certification, see 3A® standard 00-01-2018
section E1.1.1 for proper procedure and requirements.
• Re-assemble the equipment per the assembly section of this manual.
• Check the equipment for proper operation and perform leak test if necessary.
9 dixonvalve.com • 800.789.1718 HSC & EHSC | IOM
Installation & Start-Up
Function Testing
The information provided in this manual is intended to be used as a guide for proper functionality. Before installation, test the equipment
under the specific conditions of the application in a safe, controlled environment. Variations in application conditions can cause equipment
to fail, even though it passed an initial test.
□ Check visually to ensure that the equipment is not leaking.
□ Any defective seal that could have been damaged during disassembly or assembly must be replaced.
□ Check all equipment components for any signs of damage and replace damaged components.
□ Ensure that all screw fittings are tight if applicable.
□ Ensure that any pneumatic hose connections are free of leaks if applicable.
□ Confirm all pipes and fittings connected to the equipment permitted for use are in the intended pressure range.
□ Confirm all electrical installations are protected sufficiently and in accordance with appropriate safety standards if applicable.
□ Check that the maximum pressure indicated on the equipment or in the specifications section of this manual has been complied
with.
Installation Orientation
Equipment must be installed in the proper orientation to ensure proper functionality and cleanability. Please refer to the following
diagrams below for proper installation.
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