For most industrial installations, a ball valve from the catalog solves the problem. However, there are applications where process conditions—extreme pressures, aggressive fluids, non-standard installation geometries—go beyond what any catalog can systematically offer. In such cases, custom manufacturing is not a premium option: it is the only technically correct solution.
Below are the real advantages of custom ball valve production, considering not cost as the main variable, but technical suitability for the service.
Material selection without stock limitations
In standard production, manufacturers offer what is economically viable to keep in stock: 316 stainless steel, carbon steel, bronze, and at most, some alloys with sufficient demand to justify inventory. This range covers many services, but not all.
In custom manufacturing, the material of the body, stem, ball, and seats is selected exclusively based on the fluid and service conditions. Hastelloy C-276, Monel, Titanium, Duplex, Superduplex, or mixed combinations are viable without depending on standard availability.
In services involving wet chlorine, concentrated acids, aggressive gas mixtures, or high-purity environments, material choice is not a preference—it is a critical technical variable that determines valve lifespan and process safety.
Geometry adapted to the installation, not the other way around
Catalogs impose conditions: the installation adapts to the valve. In custom manufacturing, the relationship is reversed.
This is crucial in several common scenarios:
- Non-standard face-to-face dimensions. Existing lines that cannot accommodate standard valve lengths, due to space constraints or legacy configurations.
- Mixed connections. Flanged on one side and welded on the other, or any combination not typically available in catalogs.
- Asymmetric reductions or non-standard bores. Single-sided reductions, specific flow paths, or body geometries constrained by available space.
Forcing a standard geometry where it does not fit is not just a mechanical issue: it can generate flange stress, complicate maintenance, or compromise design flow.
Sealing performance designed for the specific service
In standard production, seats and packing are designed to cover a broad range of conditions. This is the natural consequence of manufacturing for multiple services. The result is adequate sealing for most applications, but not optimized for any specific one.
In custom manufacturing, seats are designed for the specific fluid, exact temperature, and expected operating cycle. This makes it possible to achieve higher sealing classes when required: ISO 5208 Class A for critical services, or fugitive emissions according to ISO 15848 for applications with atmospheric emission requirements.
In hydrogen, oxygen, or volatile hydrocarbon services, the difference between “standard” sealing and sealing “designed for the specific fluid” is far from marginal.
Project-specific documentation and certification from the design stage
Documentation requirements in sectors such as oil & gas, petrochemicals, or power generation often go well beyond a 3.1 certificate and factory leak testing. Custom manufacturing allows these requirements to be included in the project scope from the design phase, rather than added later:
- Material certificates 3.2 with third-party inspection designated by the client
- NACE MR0175 / ISO 15156 for sour service environments with H₂S presence
- Leak testing with helium for high-purity or vacuum services
- Certified oxygen cleaning with specific degreasing and packaging protocols
- Full heat traceability from raw material to finished valve
In standard production, many of these requirements are difficult to achieve consistently. In custom manufacturing, they are part of the contractual scope.
Functional integration at the factory
Installing an actuator on a standard valve in the field—along with its gearbox, position indicator, locking system, or purge—is common practice. It works, but technical responsibility is fragmented between the valve manufacturer, actuator supplier, and installer.
Custom manufacturing allows all these elements to be integrated at the factory as a unified assembly: actuator, gearbox, heating jacket, purge system, position indicator, or locking device are assembled, adjusted, and tested before delivery. The client receives a single unit with unified technical responsibility and documented functional testing.
This is not just an organizational advantage: it reduces compatibility risks, simplifies field installation, and provides complete system test documentation.
Quality control across the entire manufacturing chain
Custom manufacturing increases the importance of the supply chain. If casting, machining, welding, non-destructive testing, and final assembly occur in different environments, across multiple countries and standards interpretations, real traceability becomes difficult to guarantee.
Fully European manufacturing—such as that carried out by FHT in the Basque Country, a region with a strong steel industry tradition—means every phase takes place within an audited chain under a consistent regulatory framework. Any deviation is detected and corrected within the same environment, with response times impossible in globally distributed supply chains.
The result is effective traceability—not just declared—from raw material to finished valve.
When standard production is still the right choice
It is important to be clear: custom manufacturing is not a universal solution. When fluid, pressure, and temperature fall within catalog ranges, connections are standard, and documentation requirements are met with a 3.1 certificate, a catalog valve offers shorter lead times, lower unit cost, and immediate stock availability.
The most common specification mistake is not choosing custom manufacturing when unnecessary—it is trying to make a standard valve perform in a service it was not designed for.
Special valves: the middle ground
Between catalog products and fully custom projects, there is an intermediate solution worth considering. FHT special ball valves are configurations designed for specific applications—oxygen service, hydrogen, cryogenics, high purity, double block and bleed (DBB)—with a defined base design that can be adapted to customer parameters.
This category reduces lead time and cost compared to a fully custom project, while still meeting the technical requirements of demanding services. It is often the entry point when the application is challenging but dimensions and configurations remain within known ranges.