ENGINEERED CUSTOMIZATION
Custom Safety Valve Solutions
Special materials, severe temperatures, high pressure, corrosive media, backpressure and non-standard interfaces are converted into a controlled engineering, approval, manufacturing and test route.
APPLICATION FIRST
Configuration follows verified service data
CUSTOMIZATION DRIVERS
Six variables determine whether a standard configuration is enough.
Each request is screened for feasibility, compliance scope, test method, lead-time impact and required customer approval.
01
Special materials
Carbon, low-temperature, alloy, stainless, duplex and nickel-alloy options are reviewed against pressure, temperature, medium and product form.
02
Low / high temperature
Body, trim, spring, seals, bonnet arrangement and thermal movement are checked for the specified temperature envelope.
03
High pressure
Pressure boundary, inlet size, orifice, spring range, connection class and test pressure are verified together.
04
Corrosive or toxic media
Wetted materials, trim, bellows, soft parts, fugitive risk, cleaning and documentation are defined by the actual medium.
05
Backpressure
Conventional, balanced-bellows or pilot-operated arrangements are evaluated from superimposed and built-up backpressure behavior.
06
Connections and envelope
Flanged, threaded or welded interfaces, rating, facing, orientation, inlet/outlet sizes and dimensional limits are confirmed before design freeze.
REQUIRED INPUTS
A custom valve cannot be defined from pressure and size alone.
Unknown values can be marked clearly. HHSV identifies missing inputs and records calculation assumptions before final selection.
INPUT GROUP
MINIMUM DETAIL
ENGINEERING DECISION
Service data
Medium, phase, required capacity, operating and set pressures, temperature
Relieving case and sizing basis
Backpressure
Constant / variable, superimposed / built-up, maximum values
Conventional, bellows or pilot configuration
Materials
Composition, corrosion allowance, NACE or cleanliness requirement
Body, trim, bellows, seal and fastener selection
Interfaces
Inlet/outlet sizes, rating, facing, connection type, orientation, envelope
Connection and dimensional arrangement
Compliance
Design standard, certification, owner specification and nameplate need
Applicable certificate scope and deviation list
Delivery
Quantity, inspection, witness, documents, spares and required date
Manufacturing, test and MDR route
MATERIAL ROUTES
Material availability is only the first engineering check.
Suitability depends on pressure, temperature, medium, casting or forging route, heat treatment, NDT, project specification and certificate coverage.
01
Carbon / low-temperature
WCB · LCB · LC2
02
Alloy steel
WC6 · WC9
03
Stainless steel
CF8 · CF8M · CF3 · CF3M · 304 · 316 · 316L
04
Duplex stainless
F51 · F53
05
Nickel alloy
Monel
06
Corrosion-resistant alloy
Hastelloy B · Hastelloy C
CONFIGURATION REVIEW
The same set pressure can require a different valve architecture.
These categories are application routes, not blanket suitability claims. Final configuration follows verified service conditions.
PRESSURE & TEMPERATURE
High-pressure and high-temperature routes
Pressure boundary, trim, spring and connection rating are reviewed as one system.
BACKPRESSURE CONTROL
Balanced-bellows and pilot options
Configuration follows the magnitude, variability and source of backpressure.
SEVERE MEDIA
Low-temperature and corrosion routes
Materials, seals, cleaning, leakage limits and documentation are matched to service.
CONTROLLED WORKFLOW
Six stages from incomplete enquiry to traceable delivery.
Desktop uses a six-column CSS Grid; tablet uses three columns and mobile one column.
01
Requirements
Collect service, interfaces, standards, quantity, inspection and delivery inputs.
02
Engineering
Complete sizing, material review, configuration selection and assumption record.
03
Approval
Submit datasheet, calculation, drawing, deviations, certificates and document index.
04
Manufacture
Release approved BOM and drawings; control material, machining, assembly and traceability.
05
Testing
Perform specified pressure, set, reseating and seat-leakage tests with witness if required.
06
Delivery
Release valve, MDR, material records, test reports, certificates and shipping documents.
APPROVAL GATES
Changes are controlled before they reach production.
Every gate has an agreed input and a visible release decision, reducing late changes and document mismatch.
GATE
REVIEW BASIS
OUTPUT
Enquiry freeze
Service data, assumptions, valve selection and commercial scope
Technical quotation issued
Design freeze
Approved datasheet, GA drawing, BOM basis, deviations and certificate status
Manufacturing release
Inspection freeze
Approved QAP/ITP, procedures, witness points and document list
Test readiness
Shipment release
Closed inspection points, final marking, reports and MDR status
Shipping authorization
DELIVERY EVIDENCE
A custom valve is complete only when its records match the supplied item.
The final document list is agreed at quotation and approval stage, not assembled after shipment.
Material & production
MTC, PMI/NDT when specified, heat-number and serial-number traceability.
Configuration control
Approved drawings, BOM, assembly status and nameplate information.
Performance evidence
Shell, set-pressure, reseating and seat-leakage reports as applicable.
COMPLIANCE BOUNDARY
Customization does not automatically extend certification.
Each special material or configuration is checked against the applicable certificate, manufacturing entity, nameplate and project requirement before it is offered as certified.
Designed to
The design basis or dimensional arrangement follows the stated standard or project requirement.
Tested in accordance with
The stated test method and acceptance criteria were applied to the supplied scope.
Certified to
The legal entity, factory, product, model, size, pressure and marking fall within the actual certificate scope.
START WITH THE SERVICE DATA
Send the process specification, existing nameplate or incomplete datasheet.
HHSV will identify missing inputs, calculation assumptions, configuration options, compliance boundaries and the required approval route.