///Double-Action Damping Cylinders 210 bar // series HZD4
Double-Action Damping Cylinders 210 bar // series HZD4 2018-03-03T14:30:36+02:00

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“)

Mounting Types
A Base-side ball-and-socket joint (DO – Standard) Model A
E Trunnion Model E
F Rod-side flange Model F
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 .

The pipe thread of the connecting bore is designed according to ISO 228/1. The position along the perimeter can be changed (Standard P7/P8).werden. (Standard P7/P8) Damping-250
According to the stroke length, the supporting width of the piston rod is changed to reduce the load of the guidance system when the rod is completely extended.

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%)

Zylinderkraefte-Daming

The end position damping guarantees a soft braking of the stroke speed of the hydraulic cylinder in both end positions. The damping is achieved through a throttling of the flow of the liquid, whereby the kinetic energy resulting from the movement is converted to heat. The kinetic energy E as a product of all masses m acting on the piston rod and the stroke speed v at the beginning of the damping may not exceed the working volume W of the damping.Endposition

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.

Contact
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