DN600 Dual Station Hydraulic Butterfly Valve Test Bench

The integrated mature hydraulic system delivers strong clamping force with no displacement or pressure leakage during testing, making it ideal for large‑size knife gate and butterfly valves. The wide adjustable pressure range, maximum test pressure, and clamping stroke can be customized to match various specifications of butterfly valves and knife gate valves. It complies with GB and API international inspection standards and is widely used for factory outgoing QC inspection of industrial butterfly valves and knife gate valves.

DN600 Dual Station Hydraulic Butterfly Valve Test Bench, is designed to test straight‑through flanged or wafer type butterfly valves, as well as knife gate valves.

The clamping method uses grippers that clamp the opposite faces of the flanges, with adjustable clamping force and minimal external force. Sealing between the valve and blind plate is achieved through end‑face O‑ring sealing, allowing operators to observe leakage locations directly. Test media include water for hydrostatic and high‑pressure sealing tests, and low‑pressure gas (air or nitrogen at 4 to 7 bar) for pneumatic tightness tests. The bench completes three test items: 1.5 times nominal pressure hydrostatic shell test, 1.1 times nominal pressure high‑pressure water seal test, and 4 to 7 bar low‑pressure air seal test. The left workstation covers a test range of DN50 to DN250, with valve structural length from 43 to 165 mm, flange diameter from 165 to 425 mm, and jaw disc spacing from 200 to 400 mm. It is equipped with 3 clamping cylinders, each 100 mm bore, and piston rods of 60 mm diameter, delivering a maximum clamping force of 40 tons. The right workstation covers DN250 to DN600, with valve length from 165 to 267 mm, flange diameter from 405 to 845 mm, and jaw spacing from 310 to 630 mm. 

It has 4 clamping cylinders of 160 mm bore and 90 mm piston rods, providing a maximum clamping force of 150 tons. The maximum test pressure for small sizes can reach up to 600LB (15.0 MPa), and the pressure rating is customizable per order. Key features include dual workstations covering a broad size range, adjustable jaw spans for quick changeover, end‑face O‑ring sealing for easy leak diagnosis, and support for both hydrostatic and pneumatic tests meeting API 598 requirements. This bench is suitable for valve manufacturing plants, district heating networks, oil and gas pipelines, mining and metallurgy, MRO workshops, incoming quality control for large end‑users, and third‑party inspection agencies.

In summary, this DN600 Dual Station Hydraulic Butterfly Valve Test Bench offers high efficiency, strong clamping power, and flexible customization, making it an excellent choice for high‑volume quality control of butterfly and knife gate valves.

Features

1.Dual workstations cover DN50 to DN250 and DN250 to DN600, with small sizes up to 600LB pressure class. This is unlike single range units and is proven by 40 ton and 150 ton clamping forces.

2.Clamping jaws grip behind flanges with adjustable force, minimizing external stress. This ensures realistic test results through a balanced multi cylinder design.

3.End face O ring sealing makes leak points directly visible. This cuts fault diagnosis time by about 50 percent compared to conventional blind seals.

4.The machine supports both hydrostatic tests at 1.5 and 1.1 times rated pressure, and low pressure air tests at 4 to 7 bar. One machine performs shell, seal, and tightness tests, meeting API 598 standards.

5.Adjustable jaw span from 200 to 630 millimeters fits lengths from 43 to 267 millimeters and flanges up to 845 millimeters in diameter. This enables changeover in minutes, unlike fixed fixture types.

Technical Specifications Table

Stress Test Scope Table（MPa）

FAQ

1.What is the test diameter range of this bench?

The left workstation covers DN50 to DN250, and the right workstation covers DN250 to DN600, enabling simultaneous testing of different sizes.

2.What types of valves can be tested?

It is designed for straight‑through flanged or wafer type butterfly valves, as well as knife gate valves with flange connections.

3.What test media are supported?

Water for hydrostatic and high‑pressure sealing tests, and low‑pressure gas (air or nitrogen at 4 to 7 bar) for pneumatic tightness tests.

4.What test items can it perform?

It performs 1.5 times nominal pressure hydrostatic shell test, 1.1 times nominal pressure high‑pressure water seal test, and 4 to 7 bar low‑pressure air seal test.

5.What are the clamping forces for each workstation?

The left station provides 40 tons, and the right station provides 150 tons, ensuring stable sealing even under high test pressures.

6.What are the adjustable dimensional ranges?

For the left station: valve length 43‑165 mm, flange diameter 165‑425 mm, jaw spacing 200‑400 mm. For the right: length 165‑267 mm, flange diameter 405‑845 mm, jaw spacing 310‑630 mm.

7.Can the pressure rating be customized?

Yes, the maximum test pressure and clamping stroke can be tailored to match specific valve specifications and customer requirements.

8.Which international standards does it comply with?

It meets GB and API inspection standards, ensuring reliable and repeatable test results for industrial valves.

9.What are the main application scenarios?

It is widely used in valve manufacturing plants, oil and gas pipelines, district heating, mining, metallurgy, MRO workshops, and third‑party inspection agencies.

10.How does the dual‑station design improve efficiency?

Both stations can operate simultaneously, allowing testing of two different valve sizes at the same time, which greatly increases throughput and reduces labor costs compared to single‑station units.