MTS Model 685.53 Grip Control Module - Manual (Page 6)

Model 685.53 Grip Control Module 6
Functional Description
Introduction
Functional Description
The 685.53 Hydraulic Grip Control Module is designed to provide the hydraulic
grip control for specimen grips and includes the following features.
• Hydraulic flow control determines how fast the grips operate.
• The hydraulic pressure can be adjusted between 0.7 and 20.7 MPa (100 and
3000 psi).
• Provides independent grip/release control for each of two grips.
Hydraulic schematic The following figure shows the hydraulic schematic for the grip control.
Model 685.53 Hydraulic Schematic
Hydraulic power unit
The Model 685.53 Hydraulic Grip Control Module gets its hydraulic pressure
from the hydraulic power unit in the lab.
Control manifold
The control manifold outputs the hydraulic control to the grips. The control
manifold includes all of the front panel controls.
Rate control
The Rate control is a needle valve that restricts the hydraulic flow, and
determines how fast the grips clamp and unclamp.
Pressure control
The Pressure control establishes the final output pressure to the grips. It works in
conjunction with another pressure reducing valve which is being used as a
pressure relief valve. These two valves work in the same fashion as the valves on
the supply manifold.
Grip control
The grip controls port the final output pressure to the grips. Each grip has two
ports, a grip port and a release port. The grip controls change the output pressure
from the grip port to the release port and vice versa. The controls also have a
midpoint where the hydraulic pressure is stopped at the grip control; this causes
the grip to stop its hydraulic movement.
Pressure Reducing Valve
0.7–20.7 MPa
(100–3000 psi)
adjustment range
Rate
Control
Hydraulic
Output
Pressure
Grip
Release
Upper Grip
Lower Grip
030 DIA
Grip Control Manifold
Release
Grip
-6R
-4P
030 DIA
Hydraulic
Source
Hydraulic
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