Bray Series 755 bidirectional knife gate valve (polyurethane-lined) is a wafer-style, bolted two-piece knife gate valve for on/off isolation in slurry pipelines. Nominal sizes range from NPS 2 to 24 (DN 60 to 600), with a maximum allowable operating pressure of 240 psi (16 bar). The valve features a field-replaceable polyurethane liner with a maximum service temperature of 80°C and is available with a range of body and gate materials, as well as manual, pneumatic, hydraulic, or electric actuation. It is suitable for bidirectional isolation in slurry transport pipelines handling solid particles and corrosive media in mining, mineral processing, tailings, and chemical applications.
Series 755 bidirectional knife gate valve product image
1 / 1
Series 755 bidirectional knife gate valve product image
Bray Series 755 Bidirectional Knife Gate Valve (Polyurethane Lining)
Bidirectional knife gate valve for abrasive and corrosive slurries, available with polyurethane lining
Genuine product assurance
We can help verify product data and purchasing details.
Model confirmation
Confirm model, connection and key options before ordering.
After-sales support
After-sales communication support is provided according to the order agreement.
Specifications
- Nominal Size Range
- NPS 2 to 24 / DN 60 to 600
- Maximum Allowable Operating Pressure
- 240 psi (16 bar)
- Body Design
- Wafer-style, two-piece bolted body
- Body Materials
- Ductile iron, carbon steel (WCB), CF8 stainless steel, CF8M stainless steel, CF3M stainless steel
- Gate Materials
- 304, 316, 317 stainless steel, SAF 2507, SAF 2205, 17-4PH, Hastelloy® C, Monel®
- Stem Material
- 304 stainless steel
- Seat Material Temperature Range
- Buna-N: -34 to 194°F (-36 to 90°C); EPDM: -65 to 248°F (-54 to 120°C); Viton®: -15 to 392°F (-26 to 200°C)
- Maximum Packing Temperature
- PTFE/Buna-N: 194°F (90°C); PTFE/Viton®: 392°F (200°C); PTFE/EPDM: 248°F (120°C)
- Maximum Liner Temperature
- 176°F (80°C)
- Liner Type
- Field-replaceable polyurethane liner
- Design Standard
- MSS SP81
- Testing Standard
- MSS SP151
- Face-to-Face Standard
- MSS SP81
- Certifications
- ATEX, CRN, PED, PE(S)R, TR CU, UA TR
- Actuator Options
- Handwheel, bevel gear, pneumatic, hydraulic, electric
Application scenarios
Isolation of Abrasive Slurry Lines in Mineral Processing
Used for on-off isolation in slurry transport and tailings pipelines at mineral processing plants. This series is designed for abrasive and corrosive slurries, can be configured with field-replaceable polyurethane liners, and isolates slurry lines through a bidirectional sealing design.
Corrosive Slurry Transfer and Equipment Isolation in Chemical Processing
Used to isolate corrosive slurry pipelines containing solid particles and the inlet and outlet connections of related equipment in chemical production. This series offers a variety of stainless steel and corrosion-resistant alloy materials, and uses a two-piece bolted valve body that allows material selection based on the corrosivity of the medium.
Selection points
Field-Replaceable Polyurethane Liner
The Series 755 features a field-replaceable polyurethane liner for abrasive slurry applications. The liner has a maximum operating temperature of 80°C.
Bidirectional Zero-Leakage Shutoff Seat
A steel-reinforced molded perimeter seat provides bidirectional zero-leakage shutoff, making it suitable for applications requiring bidirectional isolation.
Wafer-Style Two-Piece Bolted Body
The valve body features a wafer-style, two-piece bolted construction for easy maintenance of internal components.
Multiple Body and Gate Material Options
The body is available in ductile iron, WCB, and various stainless steel materials. Gate options include 304, 316, and 317 stainless steel, as well as SAF duplex steel, Hastelloy C, and Monel, allowing selection based on media corrosiveness and wear risk.
Multiple Actuation Options
Handwheel, bevel gear, pneumatic, hydraulic, and electric actuation options are available to meet manual or automated control requirements.
Installation & maintenance notes
Verify Polyurethane Liner Temperature Limit
Before installation, verify that the media temperature does not exceed the polyurethane liner's maximum allowable temperature of 80°C.
Verify System Pressure Meets Valve Limits
Before installation and commissioning, verify that the system operating pressure does not exceed the valve's allowable pressure limit.
FAQ
How does the Series 755 bidirectional knife gate valve work?
The Series 755 achieves bidirectional zero-leakage shutoff through its two-piece body and steel-reinforced seat. The field-replaceable polyurethane liner improves durability in abrasive slurry applications and supports use in corrosive operating conditions.
What body materials are available for the Series 755 during valve selection?
Available materials include ductile iron, carbon steel (WCB), CF8, CF8M stainless steel, and CF3M stainless steel to accommodate different corrosive media and temperature conditions. The specific configuration should be confirmed based on the medium and operating conditions.
What are the pressure rating and size range of the Series 755?
The maximum allowable operating pressure is 240 psi (16 bar), with sizes ranging from NPS 2 to 24 (DN 60–600).
How are the gate and seat materials suited to abrasive media?
Gate materials include multiple stainless steel grades and alloys, such as 304, 316, 317, SAF 2507, SAF 2205, 17-4PH, Hastelloy C, and Monel. The steel-reinforced perimeter seat provides bidirectional zero-leakage shutoff. The specific materials should be confirmed based on the medium and temperature conditions.
What are the common maintenance points and installation considerations?
The two-piece body design facilitates maintenance, while the field-replaceable polyurethane liner helps extend service life. Actuator options include handwheel, gear, pneumatic, hydraulic, and electric configurations. Installation should follow the guidance of applicable standards such as MSS SP81/SP151. Specific maintenance procedures should be confirmed based on the actual valve configuration and site conditions.
Documents
Product Brochure - Bidirectional Polyurethane-Lined Slurry Valve, Series 755Product information · EnglishProduct Brochure - Knife Gate and Slurry Valve Product GuideProduct information · EnglishProduct Guide - Knife Valves - Product GuideProduct information · EnglishProduct Brochure - Bidirectional Slurry Valves with Urethane Lining, Series 755Product information · EnglishProduct Brochure - Bidirectional Slurry Valves with Bonded Urethane Lining, Series 755HPProduct information · EnglishIOM Manual - Bidirectional Knife Valve with Perimeter Seat, Series 755/755HPManual · EnglishIOM Manual - Bidirectional Knife Valve with Perimeter Seat, Series 755Manual · English