Galvanized Conical Unions
A galvanized taper seat union is a zinc-coated malleable cast iron fitting that joins two galvanized pipes, or a pipe and equipment, detachably and seals without a gasket through its taper metal-to-metal seat.
It is used at points that need maintenance such as pumps, booster sets, water tanks and irrigation filters. It is supplied in 9 sizes from 1/2″ to 4″, plus a taper seat union with one male-threaded end.
Main Applications
- Booster set and pump inlet-outlet connections
- Removing water tank outlet valves
- Irrigation filter and fertilizer tank connections
- Fire pump and test line connections
- Large-bore removal points in water meter groups
- Cooling tower and process water equipment
Technical Data
| Fitting type | Taper seat union: two bodies and a nut |
|---|---|
| Product standard | TS EN 10242, design symbol A (manufacturer information) |
| Material | Malleable cast iron (depending on model) |
| Coating | Hot-dip galvanized |
| Coating mass | Average at least 500 g/m² (sales sheet information) |
| Thread | ISO 7-1 Rp female thread (both ends) |
| Seat | Taper, metal-to-metal; no gasket |
| Sizes | 1/2″, 3/4″, 1″, 1 1/4″, 1 1/2″, 2″, 2 1/2″, 3″, 4″ (product range) |
| Male-end taper union | One R male end; 1/2″, 1″ (product range) |
| Permissible pressure | 25 bar, −20 … +120 °C (EN 10242, design A) |
| Leak test | At least 5 bar air or 20 bar water (sales sheet information) |
| Nut | Hexagonal, zinc-coated malleable iron |
Material Options
| Part | Galvanized malleable iron | Black malleable iron | Stainless steel casting |
|---|---|---|---|
| Body (two pieces) | Malleable iron EN-GJMB-350-10 (depending on model) | Blackheart malleable cast iron B 350-10 | Investment casting 1.4408 (AISI 316 equivalent), depending on model |
| Nut | Zinc-coated malleable iron | Blackheart malleable cast iron B 350-10 | Stainless casting, depending on model |
| Seat surface | Taper metal-to-metal | Taper metal-to-metal | Taper metal-to-metal, depending on model |
| Surface | Hot-dip zinc | Black, uncoated | Stainless, uncoated |
| Pressure rating | 25 bar −20…120 °C (EN 10242) | 25 bar −20…120 °C, 20 bar 300 °C (EN 10242) | Depending on model |
Which material? Galvanized taper seat unions are used at pump and tank connections on water and fire lines; black taper unions are preferred in hot heating and steam lines.
Advantages
Time Saved in Maintenance
- Pump and tank connections open with the nut
No Gasket to Replace
- The taper metal-to-metal face can be retightened repeatedly
Male-End Option
- Direct connection to a valve port with the male end
Up to 4″
- Detachable joints on large-bore water lines too
Construction and Design Features
- Two bodies with male and female taper faces and a hexagonal nut
- One R male-threaded end on the male-end type
- All parts hot-dip zinc coated
- TS EN 10242 design A
Send the union size and quantity, noting if the male-end type is needed; we will confirm a suitable galvanized taper seat union from stock.
How to Choose?
- Plan removal pointsFit at least one union at every maintenance point such as pumps, tanks and filters.
- Choose the end typeIf the port is female-threaded, a male-end taper union eliminates the intermediate nipple.
- Measure the sizeDetermine the pipe size between 1/2″ and 4″.
- Confirm the mediumUse galvanized unions on water and fire lines, black unions in hot heating.
Complementary Products
Why ORFA?
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Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.