Double-Action Damping Cylinders 210 bar // series HZD4
General information
The HZD4 series cylinders are double-action pressure cylinders with end position damping that are universally applicable due to their various models and sealing variants. The damping is not adjustable. The piston rod guide is designed to be screwable for maintenance tasks. The piston rod consists of hightensile structural steel with an approximately 25µm hard chromium-plated layer. Other materials and coatings are available on request.
Please consult us in case of radial forces and non-vertical installation.
| Technical data | |
|---|---|
| Max. operating pressure | = 210 bar |
|
Test pressure |
= 280 bar |
|
Piston ∅ |
= 40 – 125 mm |
| Temperature range (of the hydraulic fluid) |
= -20°C to +80°C |
| Pressure fluid | = Mineral oil (HL, HLP) according to DIN 51524 and DIN 51525 (standard) |
| Stroke speed | = ≤ 0,5 m/s (Standard) |
Length and stroke tolerances according to DIN7168g (see “Technical Information“)
| Accessoires | |||
|---|---|---|---|
| A-.. | Rod end | (GE..DO subject to maintenance) | Rod end A |
| B-.. | Rod end | (GE..HO subject to maintenance) | Rod end B |
| G-.. | Rod clevis | (Tolerance field H11) | Rod clevis G |
Product specifications
Order key
Please click here to download the order key .
| D1 – Groove ring and scraper made of polyurethane and a compact seal (NBR) on the piston (standard) | |
|---|---|
| Temperature | -30°C to +80°C |
| Pressure fluid | Mineral oil |
| Stroke speed | ≤ 0,5 m/s |
| Application | Standard sealing set for normal operating conditions, very high resistance to wear |
| D2 – Axial seal ring set consisting of PTFE STEP SEALS (O-ring seal made of NBR), double scraper (polyurethane) and a PTFE Glyd ring (NBR O ring seal) on the piston | |
|---|---|
| Temperature | -30°C bis +100°C |
| Pressure fluid | Mineral oil, flame-retardant Pressure fluids HFA and HFB up to +40°C;HFC up to +60°C |
| Stroke speed | ≤ 1 m/s |
| Application | Sealing set for high sliding speeds,no stick-slip effect, greater leakage than in the case of D1 and D3 |
| D2V – Axial seal ring set consisting of PTFE STEP SEALS (O-ring seal made of Viton) Double scraper (Viton O-ring seals) and a PTFE Glyd ring (Viton O ring seal) on the piston |
|
|---|---|
| Application | Double scraper (Viton O-ring seals) and a PTFE Glyd ring (Viton O ring seal) on the piston Sealing set for high sliding speeds, no stick-slip effect, higher leakages than in the case of D1 and D3, on a phosphate ester (HFD) basis for higher temperatures (+200°C) and fluids |
| D3 – Tandem sealing set consisting of groove ring (polyurethane) and PTFE STEP SEAL and a compact seal (NBR-PTFE) on the piston | |
|---|---|
| Temperature | -30°C to +80°C |
| Pressure fluid | Mineral oil |
| Stroke speed | ≤0,8 m/s |
| Application | Sealing set for high loads at minimum leakage,smooth-running stroke movements |
Theoretical cylinder force in [kN] (efficiency = 100%)
Extemsion Movement
| FB = m x a + AK x p | FB [N] | = | Braking force |
| m [kg] | = | Moved mass | |
| AK [cm²] | = | Piston area | |
| p [N/cm²] | = | System pressure | |
| v [m/s] | = | Stroke speed | |
| s [m] | = | Damping distance | |
| a [m/s²] | = | Delay | |
| a=v²/2s |
Retraction movement
| FB = m x a + AR x p | FB [N] | = | Braking force |
| m [kg] | = | Moved mass | |
| AK [cm²] | = | Piston area | |
| p [N/cm²] | = | System pressure | |
| v [m/s] | = | Stroke speed | |
| s [m] | = | Damping distance | |
| a [m/s²] | = | Delay | |
| = | 1 bar ~ 10 |
For vertical installation, the weight force of the outer load and the piston rod must be added to or subtracted from the braking force FB. The cylinder friction is not taken into consideration in the calculation.
Calculation of the average damping pressure
| PD = FB/AD | PD [N/ cm²] | = | Average damping pressure |
| FB [N] | = | Braking force | |
| AK [cm²] | = | Effective damping area | |
| 1 bar ~ 10 |
If the average damping pressure is too high, either the damping length or the system pressure must be reduced.
