Pressure Seal Bonnet  pressure seal parallel slide gate valves

Pressure Seal Bonnet pressure seal parallel slide gate valves

Design: ASME B16.34 & API 600 / MSS SP-144; BS EN 12516

Connection type:

1.END FLANGE(RF/RTJ):ASME B16.5 (2” to 24”) & ASME B16.47 series A & B(≥ 26”); BS EN 1092


Face to Face: ASME B16.10; BS EN 558

Test: API 598 or based on customer’s requirement; BS EN 12266

Product range:

Size: NPS 2″~40″(DN50~DN1000)

Pressure Rating: ASME CLASS 900LB~2500LB(PN150~PN420)

Product Detail

Product Tags

Material of body



Carbon Steel


Low Temperature Steel


Stainless Steel

CF8, CF8M, CF3, CF3M, CF8C, CF10, CN7M, CG8M, CG3M etc.

Alloy Steel

WC6, WC9, C5, C12, C12A

Duplex Steel


Nickel-Based Alloy

Monel, Inconel625/825, Hastelloy A/B/C etc.




Carbon Steel


Low Temperature Steel


Stainless Steel

F304, F316, F321, F347

Alloy Steel

F11, F22, F5, F9, F91

Duplex Steel

F51, F53, F44

Nickel-Based Alloy

Monel, Inconel625/825, Hastelloy A/B/C

Operated type

Manual, Gear box, Actuator operated, Pneumatic operated

Features and Benefits

Nantong TH-Valve's pressure seal parallel slide gate valves are well-suited for clean service and steam applications. The design of these valves relies on the pressure from the main system to maintain the integrity of the seat by acting on the downstream disc. This design eliminates the need for wedging action or additional loading on the seats. Moreover, the parallel slide valve design eliminates concerns about thermal binding, providing a notable safety advantage in high-temperature environments.

Here are some key features of Nantong TH-Valve's pressure seal parallel slide gate valves:

1. Body: The valves are constructed with superior strength forgings or high-quality castings, ensuring durability and reliability.

2. Live-loaded bonnet bolting: The valves feature bonnet bolting that is designed to store the necessary sealing load during pressure or temperature-induced transients, which can cause bonnet movement.

3. Unique parallel slide forged unit design: The valves incorporate a specialized design comprising all operating parts of the slide discs. This design is precision guided, resulting in a longer lifespan for the disc, seat, and body.

4. Hardfaced seating faces: The seating faces of the valves are reinforced with hardfacing to resist erosion, increasing their resistance to wear and tear.

5. Non-rotating stem: The valves are equipped with a non-rotating stem, which reduces the operating torque required during valve operation.

6. Bypass valves: In situations where the valve is exposed to very high differential pressure, it is recommended to use bypass valves to equalize the pressure across the disc before opening.

7. Equalizing and bypass pipes and valves: Nantong TH-Valve provides a variety of configurations for equalizing and bypass pipes and valves. These options ensure that the valve can open under any operating conditions, preventing issues such as over pressurization, pressure locking, and thermal binding.

8. Optional live-loading of packing: The valves offer the option of live-loading the packing, which extends the service life and reduces emissions, particularly in applications with large pressure/temperature transients or frequent cycling.

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