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CH757 Double-acting Compact Seals




Product
name
Product
name 		Application Material Profile Standard Hardness
Shore A 		Pressure - (max) bar Temperature Sliding Speed
(max m/sec) 		Dimension Price Pressure
Rating 		Rotary
Speed 		pH
Range 		Dimensions 
CH757 Double-acting Compact Seals PTFE
NBR		 ≤400 -30°C+105°C ≤3.0 CH757 - DIMENSIONS

CH757 is a symmetrical four piece double acting sealing set which consists of one PTFE profile ring, one X-ring as main sealing element and two O-rings as energizing elements. It is recommended to use with minimum two piston guide rings in long stroke cylinders, minimum one guide ring in short stroke cylinders and low radial loaded cylinders. For special applications that require high temperatures or resistance to chemicals, CH757 is being manufactured with special mixture PTFE and FKM material.

 

PROFILE

PRODUCT ADVANTAGES
  • Wide range of temperature and chemicals depending on the o-ring and x-ring material
  • ​Low friction, free of stick-slip
  • High sealing effect in applications requiring media separation
  • Low gas permeation rate
  • Minimum static and dynamic friction coeffcient for a minimum energy loss and operating temperature
  • Simple groove design and low axial housing heights
 
APPLICATION
  • Accumulators
  • Heavy duty cylinders
  • Presses
  • Machine tools
 
INSTALLATION
It is recommended to assemble into one piece piston with special assembly tool. It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the sealing element must be oiled with system oil.
 

SURFACE ROUGHNESS

Ra (µm)

Ra (µm

SLIDING SURFACE  D

≤ 0.2

≤ 2.0

GROOVE BASE  d

≤ 1.6

≤ 6.3

SIDES OF GROOVE B

≤ 3.2

≤ 15

 

PERMISSIBLE SEALING GAP - S max mm

 

 

  
B (mm) 150 bar 250 bar 400 bar

4.2

0.25

0.15

0.10

6.3

0.30

0.20

0.15

8.1

0.30

0.20

0.15

9.5

  0.50

0.25

0.15

 

 

 

 

 

 
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