Event * REXROTH Rexroth Z2S Series Check Valve

The German Rexroth Z2S series check valve can also be used in pipelines to supply auxiliary systems where the pressure may rise above the system pressure. The German Rexroth Z2S series check valves can be mainly divided into swing type German Rexroth Z2S series check valves (rotating according to the center of gravity) and lift type German Rexroth Z2S series check valves (moving along the axis).
The function of the German Rexroth Z2S series check valve is to only allow the medium to flow in one direction and prevent the flow in the opposite direction. Usually, this type of valve works automatically, and under the pressure of fluid flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the pressure of the fluid and the self weight of the valve disc act on the valve seat, thereby cutting off the flow.
The German Rexroth Z2S series check valve belongs to this type of valve, which includes the swing type German Rexroth Z2S series check valve and the lift type German Rexroth Z2S series check valve. The rotary type German Rexroth Z2S series check valve has a hinge mechanism and a valve disc that is free to rest on the inclined valve seat surface like a door. In order to ensure that the valve disc can reach the appropriate position on the valve seat surface every time, the valve disc is designed in a hinge mechanism so that the valve disc has sufficient swing space and truly and fully contacts the valve seat. The valve disc can be made entirely of metal, or it can be embedded with leather, rubber, or a synthetic cover on top of the metal, depending on the performance requirements. When the rotary type German Rexroth Z2S series check valve is open, the fluid pressure is almost unobstructed, so the pressure drop through the valve is relatively small. The valve disc of the lifting type German Rexroth Z2S series check valve is located on the sealing surface of the valve seat on the valve body. Except for the valve disc, which can be freely raised and lowered, the rest of this valve is like a globe valve. Fluid pressure lifts the valve disc from the sealing surface of the valve seat, causing the medium to reflux and causing the valve disc to fall back onto the valve seat, cutting off the flow. According to the usage conditions, the valve disc can be made of all metal structure or embedded with rubber pads or rubber rings on the valve disc frame. Like globe valves, the passage of fluid through the lift type German Rexroth Z2S series check valve is also narrow, so the pressure drop through the lift type German Rexroth Z2S series check valve is greater than that through the swing type German Rexroth Z2S series check valve, and the flow of the swing type German Rexroth Z2S series check valve is less restricted.
Event * REXROTH Rexroth Z2S Series Check ValvePrecautions for:
1. Do not let the German Rexroth Z2S series check valve bear weight in the pipeline system. Large German Rexroth Z2S series check valves should be independently supported to prevent them from being affected by the pressure generated by the pipeline system.
2. During installation, pay attention to the direction of medium flow, which should be consistent with the arrow direction marked on the valve body.
3. The lifting vertical flap German Rexroth Z2S series check valve should be installed on a vertical pipeline.
4. The lifting horizontal flap German Rexroth Z2S series check valve should be installed on a horizontal pipeline.
The pressure of the medium before and after the German Rexroth Z2S series check valve is in a state of near equilibrium and mutual "sawing". The valve disc often hits the valve seat, and some brittle materials (such as cast iron, brass, etc.) made valve discs are broken.
Event * REXROTH Rexroth Z2S Series Check ValveCharacteristics of:
Sandwich plate valve for vertical stacking
Transplant mode compliant with ISO 4401-05-04-0-05 and ISO 4401-05-05-0-05
To block one or two user connections without leakage, optional
Different opening pressures
Equipped with pre drilled holes (standard); No need to pre open optional
The installation kit for the German Rexroth Z2S series check valve is provided separately
Anti corrosion design
Even during longer downtime, it can be used to block one or two user connections without leakage.
There is free flow in the direction from A? To A? Or B? To B?, and flow is blocked in the opposite direction.
For example, if there is flow passing through the valve in the direction from A to A, control the slide valve (1) to move towards the B side, open the ball seat valve (2), and then push the cone (3) away from the valve seat. Now, hydraulic oil can flow from B to B?.
In order to ensure the reliable closure of the ball seat valve (2), the control spool valve (1) must be released hydraulically (see circuit example).
1、 Swing type German Rexroth Z2S series check valve: The valve disc of the swing type German Rexroth Z2S series check valve is disc-shaped and rotates around the axis of the valve seat channel. Due to the streamlined flow channel inside the valve, the flow resistance is smaller than that of the lift type German Rexroth Z2S series check valve. It is suitable for large-diameter applications with low flow rate and little change in flow, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of the lift type. The rotary type German Rexroth Z2S series check valve is divided into three types: single disc, double disc, and half disc. These three forms are mainly classified according to the valve diameter, in order to prevent hydraulic shock when the medium stops flowing or flows back.
2、 Lift type German Rexroth Z2S series check valve: The valve disc slides along the vertical centerline of the valve body. The lift type German Rexroth Z2S series check valve can only be installed on horizontal pipelines. On high-pressure small-diameter German Rexroth Z2S series check valves, the valve disc can be spherical. The valve body shape of the lifting type German Rexroth Z2S series check valve is the same as that of a globe valve (which can be used interchangeably with globe valves), so its fluid resistance coefficient is relatively high. Its structure is similar to that of a globe valve, with the same valve body and disc as the globe valve. The upper part of the valve disc and the lower part of the valve cover are processed with guide sleeves. The valve disc guide sleeve can freely rise and fall inside the valve disc guide sleeve. When the medium flows downstream, the valve disc opens by the thrust of the medium. When the medium stops flowing, the valve disc descends on the valve seat by self sagging, which prevents the medium from flowing back. The direction of the medium inlet and outlet channels of the through lift German Rexroth Z2S series check valve is perpendicular to the direction of the valve seat channel; The vertical lifting German Rexroth Z2S series check valve has a medium inlet and outlet channel direction that is the same as the valve seat channel direction, and its flow resistance is smaller than that of the straight through type.
3、 Disc type German Rexroth Z2S series check valve: a German Rexroth Z2S series check valve in which the valve disc rotates around the pin axis inside the valve seat. The disc type German Rexroth Z2S series check valve has a simple structure and can only be installed on horizontal pipelines, resulting in poor sealing performance.
4、 Pipeline type German Rexroth Z2S series check valve: a valve whose valve disc slides along the centerline of the valve body. The pipeline type German Rexroth Z2S series check valve is a newly emerged type of valve, which has a small volume, light weight, and good processing technology. It is one of the development directions of the German Rexroth Z2S series check valve. But the fluid resistance coefficient is slightly higher than that of the rotary type German Rexroth Z2S series check valve.
5、 Compression type German Rexroth Z2S series check valve: This valve is used as a boiler feedwater and steam shut-off valve, and it has the comprehensive function of a lifting German Rexroth Z2S series check valve and a globe valve or angle valve.