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English Views: 0 Author: Jodie Publish Time: 2026-06-30 Origin: Site
The DD-S1 close type hydraulic quick coupling is built for high-pressure hydraulic systems that need fast, safe connections. It uses a double poppet valve design to stop leaks when disconnected and a ball-lock mechanism to keep the coupling secure when connected.
Most hydraulic failures start at the connection point. The DD-S1 reduces that risk with two main features:
Poppet valves on both halves close automatically when you disconnect. No oil spills on the ground. No dirt enters the system.
Ball-lock retention holds the socket and plug together under vibration and pressure spikes.
These features make the DD-S1 a good fit for construction, agriculture, forestry, oil equipment and steel mill machinery.
Each half has its own valve. When the coupling is apart, both valves shut. This prevents oil loss and keeps the work area clean.
Push the plug into the socket. The valves open by themselves. The system is ready to work. No extra steps needed.
Critical parts are induction hardened. The socket and plug are machined from solid bar steel. The result is a coupling that lasts under heavy use.
The DD-S1 meets ISO 7241-A. It interchanges with:
Faster ANV series
Aeroquip 5600 series
Hansen HA 15000 series
This means you can use DD-S1 as a replacement part without redesigning your system.
The DD-S1 comes in two halves: the socket (female) and the plug (male). Both are precision machined to match the ISO 7241-A profile. The chart below shows the main dimensions for standard sizes.
DD-S1 socket and plug dimensions.
Common thread types include BSP (G thread) and NPT. Sizes range from 1/4 inch up to 2 inches.
Size | Rated pressure (PSI) | Flow (GPM) | Temperature range |
|---|---|---|---|
1/4" | 5000 | 3 | -20°C to +120°C |
3/8" | 4000 | 6 | -20°C to +120°C |
1/2" | 4000 | 12 | -20°C to +120°C |
3/4" | 3000 | 28 | -20°C to +120°C |
1" | 3000 | 50 | -20°C to +120°C |
1-1/4" | 2000 | 88 | -20°C to +120°C |
1-1/2" | 2000 | 220 | -20°C to +120°C |
2" | 2000 | 240 | -20°C to +120°C |
Need exact dimensions like LS, D, HEX1 and A? Request the full DD-S1 specification sheet.
DD-S1 couplings work in any hydraulic system that needs frequent connection and disconnection. Common uses include:
Construction machines such as excavators and loaders
Agricultural tractors and harvesters
Forestry machines
Oil field and drilling equipment
Steel mill and metal processing machinery
Hydraulic power units and test benches
We supply DD-S1 close type hydraulic quick couplings in a wide range of sizes and thread types. We ship from stock and support bulk orders for OEMs, distributors and service teams.
When you order from us, you get:
ISO 7241-A compliant parts
Interchange with major brands
Competitive pricing for small and large quantities
Fast quotation and reliable delivery
The DD-S1 is a close type hydraulic quick coupling with poppet valves on both the socket and plug. The valves close automatically when the coupling is disconnected to stop oil loss. They open automatically when the coupling is connected.
Yes. The DD-S1 follows ISO 7241-A and interchanges with Parker 6600, Faster ANV, Aeroquip 5600 and Hansen HA 15000 series.
Pressure ratings vary by size. The 1/4 inch DD-S1 is rated up to 5000 PSI. Larger sizes are rated for lower pressures. See the full DD-S1 specification table for exact ratings.
DD-S1 couplings are available with BSP and NPT threads. Common sizes include G1/4, G3/8, G1/2, G3/4, G1, G1-1/4, G1-1/2 and G2, plus NPT equivalents.
Visit our contact page or send an inquiry with the size, thread type and quantity you need. Our team will reply with pricing, stock status and delivery time.
Yes. We supply DD-S1 sockets, plugs and complete coupling sets in bulk for equipment manufacturers, distributors and maintenance teams.
Ready to buy DD-S1 ISO 7241-A close type hydraulic quick couplings? Contact Hand Hydraulic today for pricing, stock availability and delivery options.
Email: info@handhydraulic.com
WhatsApp: +86 18258773126