In rainwater, wastewater and agricultural water piping systems, pipelines may be affected by ground settlement, lateral displacement or earthquakes. Particularly for underground pipelines, uneven ground movement can generate forces and deformation in the pipeline, affecting the joints and the entire system.

The Zenshin ZEV-1000 PVC Flexible Joint is specially designed for PVC pipelines, with the ability to absorb large lateral displacement thanks to its flexible structure. The product provides a flexible connection point capable of accommodating pipeline movement, while offering low weight and convenient installation.

According to Zenshin’s technical documentation, the ZEV-1000 is designed for rainwater pipelines, sewage pipelines and agricultural water pipelines, particularly suitable for underground piping systems.

1. Overview of the Zenshin ZEV-1000 PVC Flexible Joint

Zenshin ZEV-1000 is a Vinyl Chloride Joint – PVC flexible joint developed for PVC piping systems requiring displacement absorption capability.

The distinctive feature of the ZEV-1000 lies in its flexible joint structure, which allows relatively large movement between connected pipe sections. Compared with conventional joints, the product is specifically designed to better accommodate lateral movement of the pipeline.

According to the catalogue, the product provides the following characteristics:

• High flexibility.
• Good extensibility.
• Large lateral displacement absorption capability.
• Low weight.
• Easy installation.
• Suitable for underground pipelines.

The ZEV-1000 is available in standard sizes from 50A to 150A, while 200A can be manufactured upon request.

2. What Is the Function of the ZEV-1000 Flexible Joint?

The ZEV-1000 flexible joint is designed to provide a flexible connection within PVC piping systems.

2.1. Absorbing Lateral Displacement

When the ground or pipeline moves in the lateral direction, the flexible joint can deform to absorb the displacement.

This capability is particularly important for underground pipelines, where the pipeline may be affected by ground movement and deformation.

The ZEV-1000 is specially designed to provide large lateral movement absorption compared with other types of joints.

2.2. Reducing the Effects of Ground Settlement

Uneven ground settlement can cause two sections of a pipeline to move relative to each other.

When a rigid connection is used, such displacement may generate significant stress at the joint.

Installing the ZEV-1000 at an appropriate location provides flexible movement capability, thereby helping reduce the effects of ground displacement on the pipeline.

2.3. Absorbing Earthquake-Induced Movement

In areas where earthquakes may occur, underground pipelines can be subjected to ground movement.

The flexible structure of the ZEV-1000 allows the joint to absorb lateral displacement, helping the pipeline system better accommodate ground movement.

2.4. Providing Flexibility to the Piping System

In addition to displacement absorption, the ZEV-1000 provides flexibility at the connection between pipe sections.

This makes the product suitable for systems where the following conditions need to be considered:

• Ground displacement.
• Settlement.
• Pipeline movement.
• Misalignment between pipe sections.

3. Construction and Materials of the Zenshin ZEV-1000

The ZEV-1000 consists of components made from PVC, synthetic rubber and reinforcing components.

According to the Parts List in the catalogue, the main components include:

3.1. Inner Tube

Material: Soft PVC.

This is the inner pipe section of the flexible joint and forms the surface in contact with the fluid.

Its relatively smooth inner surface allows the fluid to flow smoothly through the joint.

3.2. Outer Tube

Material: Hard PVC.

The outer tube works together with the joint structure to provide movement capability while maintaining the shape of the product.

3.3. Socket

Material: Hard PVC.

The socket is the section that receives the pipe end within the joint structure.

3.4. Insert Sleeve

Material: Hard PVC.

This component is installed within the connection structure to support the stability of the flexible joint.

3.5. Locking Ring

Material: Hard PVC.

The locking ring helps retain the components of the flexible joint during installation and operation.

3.6. Seal Rubber

Material: Synthetic Rubber.

The seal rubber provides the sealing function at the connection point.

4. Outstanding Features of the ZEV-1000 PVC Flexible Joint

4.1. Large Lateral Displacement Absorption Capability

This is the most important characteristic of the ZEV-1000.

The product is specially designed to absorb large lateral movement compared with conventional types of joints.

The displacement absorption capability depends on the pipeline size and the effective length of the flexible joint.

4.2. Smooth Inner Surface

According to the product documentation, the ZEV-1000 has a smooth inner surface, allowing wastewater or other fluids to flow smoothly.

This is an important advantage when the product is used in drainage and wastewater systems.

4.3. Lightweight and Easy to Install

Because the product uses PVC materials, it has relatively low weight and is convenient for transportation and installation.

This is particularly useful for projects requiring a large number of flexible joints or pipelines installed in limited working spaces.

4.4. Suitable for Underground Pipelines

The ZEV-1000 is designed for use in underground pipelines.

This is one of the important applications of the product because underground pipelines are directly affected by ground movement and deformation.

4.5. Flanges at Both Ends Can Be Manufactured

In addition to the standard configuration, the catalogue states that a flange at both ends configuration can also be manufactured.

Depending on the piping system requirements, the connection type and dimensions should be confirmed before ordering.

5. Technical Specifications of the Zenshin ZEV-1000

Specification	ZEV-1000
Product type	PVC Flexible Joint
Size	50A ~ 150A
Optional size	200A available upon request
Maximum operating temperature	Max. 40°C
Applications	Rainwater, sewage, agricultural water
Inner tube material	Soft PVC
Outer tube material	Hard PVC
Socket	Hard PVC
Insert Sleeve	Hard PVC
Locking Ring	Hard PVC
Seal Rubber	Synthetic Rubber
Application condition	Non-pressure piping
Underground application	Available

Important note: According to the catalogue, the ZEV-1000 is for non-pressure liquid service only, such as rainwater and sewage. Do not use the product for pressure piping.

6. Displacement Absorption Capability of the ZEV-1000

The displacement absorption capability of the ZEV-1000 depends on the pipe size and Effective Length (ℓ).

The Zenshin catalogue provides a selection table showing the required effective length corresponding to different levels of Lateral Movement.

Required Effective Length According to Lateral Movement

Size	100 mm	200 mm	300 mm	400 mm	500 mm	600 mm	700 mm	800 mm
50A	600	700	750	800	1000	1200	1300	1500
75A	650	700	800	900	1100	1200	1300	1500
100A	700	800	900	1000	1200	1300	1500	1600
125A	800	1000	1300	1500	1600	1700	1800	2000
150A	1000	1200	1400	1600	1800	1900	2000	2200

Unit: mm.

The table shows that as the required lateral displacement increases, the required effective length also increases.

Therefore, when designing or selecting the ZEV-1000, it is necessary to determine not only the pipeline size but also the required displacement to be absorbed.

7. Standard Dimensions of the ZEV-1000

According to the Standard Dimension table, the Zenshin ZEV-1000 is available in the following standard dimensions:

Size	Effective Length ℓ (mm)	Socket A (mm)	Plug B (mm)	Product Length L (mm)	Maximum Length (mm)
50A	400	30	25	455	4000
75A	500	40	40	580	4000
100A	600	50	50	700	4000
125A	800	70	60	935	4000
150A	1000	84.5	80	1165	4000

The catalogue also states that 200A can be manufactured.

Actual dimensions should be confirmed according to the model, system requirements and installation conditions before ordering.

8. Required Length for 90° Bending

In addition to its lateral displacement absorption capability, the ZEV-1000 documentation also provides information on the bending radius and required length for 90° bending.

Size	Minimum Bending Radius R (mm)	Required Length ℓ at 90° (mm)
50A	≥ 320	≥ 910
75A	≥ 490	≥ 770
100A	≥ 590	≥ 930
125A	≥ 650	≥ 1030
150A	≥ 760	≥ 1200

These specifications are relevant when the ZEV-1000 is installed at locations where the pipeline needs to change direction.

When designing the piping system, the bending radius and required length must comply with the product specifications to avoid deformation exceeding the design conditions.

9. Applications of the Zenshin ZEV-1000 Flexible Joint

According to Zenshin’s documentation, the ZEV-1000 is mainly used for non-pressure piping systems.

9.1. Rainwater Pipelines

The ZEV-1000 can be used in rainwater pipelines, particularly underground pipelines requiring the ability to accommodate ground displacement.

9.2. Sewage Pipelines

This is one of the main applications of the product.

The smooth inner surface allows wastewater to flow smoothly, while the flexible structure enables the joint to absorb pipeline displacement.

9.3. Agricultural Water Pipelines

The catalogue also specifies applications for agricultural water pipelines.

The product can be considered for pipelines requiring flexibility at locations where displacement may occur.

9.4. Underground Pipelines

The ZEV-1000 is particularly suitable for consideration in underground piping systems, where the ground may experience movement or settlement.

10. Guide to Selecting the ZEV-1000 According to Size and Displacement

To select a suitable ZEV-1000 flexible joint, the following basic steps should be followed:

Step 1: Determine the Pipeline Size

Determine the nominal pipeline size:

50A, 75A, 100A, 125A or 150A.

For 200A pipelines, the manufacturing availability should be confirmed upon request.

Step 2: Determine the Lateral Displacement

Determine the expected displacement of the pipeline, for example:

100 mm, 200 mm, 300 mm, 400 mm, etc.

Step 3: Determine the Required Effective Length

Based on the displacement table in the catalogue, select the corresponding Effective Length ℓ according to the pipeline size and required displacement.

For example, for a 100A pipeline with a required lateral displacement of 300 mm, the table indicates a required effective length of 900 mm.

Step 4: Check the Temperature

The maximum operating temperature specified is:

40°C.

Step 5: Check the Pressure Condition

This is an important point to consider:

The ZEV-1000 is not intended for pressure piping.

The product is designed for non-pressure liquid applications such as rainwater and sewage.

11. Important Notes When Using the ZEV-1000

11.1. Do Not Use for Pressure Piping

The catalogue clearly states that the product is for non-pressure liquid service only.

Therefore, the ZEV-1000 should not be used for pressure piping systems unless appropriate technical confirmation has been obtained from the manufacturer.

11.2. Check the Operating Temperature

The maximum operating temperature of the product is specified as:

40°C.

The actual fluid temperature should be checked before selection.

11.3. For Underground Pipelines

When using the ZEV-1000 for underground pipelines, the installation conditions should be carefully checked.

The catalogue notes that stones, hard materials or large pieces of hard soil should be removed from the area surrounding the product before completing the soil backfilling.

This helps reduce the risk of hard objects directly impacting the flexible joint during pipeline operation.

11.4. Check the Required Length and Displacement

The flexible joint should not be selected based solely on the pipe diameter.

The following factors should be determined simultaneously:

• Pipeline size.
• Lateral displacement.
• Effective length.
• Installation conditions.
• Bending radius, if applicable.
• Operating temperature.

12. Why Choose the Zenshin ZEV-1000 PVC Flexible Joint?

The Zenshin ZEV-1000 is designed with a focus on displacement absorption for PVC pipelines, particularly for non-pressure applications.

Large Lateral Displacement Absorption Capability

The special design of the ZEV-1000 allows the product to absorb large lateral displacement, meeting conditions where the pipeline may experience movement.

Helps Accommodate Ground Settlement and Earthquake-Induced Movement

The flexibility of the joint makes the product suitable for systems where displacement caused by ground settlement and earthquakes needs to be considered.

Smooth Inner Surface

The inner surface design allows fluids to flow smoothly, making the product suitable for rainwater and sewage systems.

Lightweight

The PVC material makes the product convenient for transportation and installation.

Suitable for Underground Pipelines

The ZEV-1000 is designed for underground pipelines, which is one of the main applications specified in the catalogue.

Multiple Sizes Available

The product is available in sizes from 50A to 150A, while 200A can be manufactured upon request, allowing it to accommodate various pipeline sizes.

Flanges at Both Ends Can Be Manufactured

The catalogue states that a flange at both ends configuration can also be manufactured upon request.

13. Conclusion

The Zenshin ZEV-1000 PVC Flexible Joint is a flexible connection solution for non-pressure PVC piping systems, featuring a large lateral displacement absorption capability.

With a construction using Soft PVC, Hard PVC and Synthetic Rubber, the product provides the required flexibility while maintaining the connection between pipe sections.

The ZEV-1000 is suitable for applications such as rainwater pipelines, sewage pipelines, agricultural water pipelines and underground pipelines. In particular, its displacement absorption capability makes the product suitable for consideration in systems that may be affected by ground settlement and earthquake-induced ground movement.

When selecting the product, it is necessary to fully check the pipeline size, required lateral displacement, effective length, bending radius, temperature and pressure conditions. In particular, it should be noted that the ZEV-1000 is intended only for non-pressure liquids and must not be used for pressure piping.

Zenshin ZEV-1000 – a specialized PVC flexible joint for pipelines, providing large lateral displacement absorption capability and helping piping systems accommodate ground settlement, ground movement and underground installation conditions.