--- title: "Gate Valve Parts & Components: A Visual Guide (With Cross-Section Diagram)" date: 2026-09-23T06:50:39Z modified: 2026-09-30T00:50:23Z permalink: "https://www.xintaivalves.com/blog/gate-valve/gate-valve-parts-components-diagram/" type: post status: publish excerpt: "" wpid: 16952 categories: - Gate Valve featured_image: "https://www.xintaivalves.com/wp-content/uploads/2026/09/6b272b7e28dfad94af05707443865f10.webp" featured_image_alt: Gate valve parts and cross-section anatomy diagram timestamp: 2026-09-30T00:50:23Z tags: - Gate Valve --- Table of Contents [Toggle](#) - [Quick Answer](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Quick_Answer) - [What Are the Main Parts and Why Do They Matter?](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#What_Are_the_Main_Parts_and_Why_Do_They_Matter) - [What Forms the Pressure Boundary in a Gate Valve?](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#What_Forms_the_Pressure_Boundary_in_a_Gate_Valve) - [Valve Body](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Valve_Body) - [Bonnet](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Bonnet) - [End Connections](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#End_Connections) - [What Parts Make Up the Gate Valve Closure Mechanism?](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#What_Parts_Make_Up_the_Gate_Valve_Closure_Mechanism) - [Gate (Wedge)](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Gate_Wedge) - [Seat Rings](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Seat_Rings) - [Seat Facing](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Seat_Facing) - [How Do the Stem and Sealing Components Work Together?](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#How_Do_the_Stem_and_Sealing_Components_Work_Together) - [Stem: Rising vs. Non-Rising](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Stem_Rising_vs_Non-Rising) - [Packing and Gland](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Packing_and_Gland) - [Back Seat](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Back_Seat) - [What Components Actuate a Gate Valve?](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#What_Components_Actuate_a_Gate_Valve) - [Handwheel and Yoke](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Handwheel_and_Yoke) - [Stem Nut and Gear Operator](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Stem_Nut_and_Gear_Operator) - [Powered Actuators](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Powered_Actuators) - [How Do These Valve Components Work Together in a Cross-Section View?](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#How_Do_These_Valve_Components_Work_Together_in_a_Cross-Section_View) - [Simplified gate valve diagram:](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Simplified_gate_valve_diagram) - [Gate Valve Parts Name Reference](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Gate_Valve_Parts_Name_Reference) - [Which Materials Suit Each Gate Valve Component?](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Which_Materials_Suit_Each_Gate_Valve_Component) - [Body and Bonnet Materials](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Body_and_Bonnet_Materials) - [Trim Materials](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Trim_Materials) - [Why Choose XINTAI for Gate Valve Components?](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-parts-components-diagram.md#Why_Choose_XINTAI_for_Gate_Valve_Components) ## Quick Answer Gate valve parts include the body, bonnet, gate, seats, stem, packing, yoke, and operating mechanism. These components must withstand system pressure, maintain shutoff, control stem movement, and limit external leakage. XINTAI Valve [gate valves](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/page/gate-valve-manufacturer.md) use cast or forged construction with component designs based on applicable API and ASME requirements. ## What Are the Main Parts and Why Do They Matter? A gate valve has one main job: to start or stop flow completely, and each part supports that duty in a different way. Knowing the names and functions of gate valve parts helps engineers troubleshoot faster. It also speeds up spare-parts ordering and drawing reviews. This guide breaks down gate valve anatomy piece by piece, from the outer body to the operating handwheel. It builds on our broader industrial gate valve guide. A labeled cross-section diagram ties every part together at the end, so each name matches a real location on the valve. ## What Forms the Pressure Boundary in a Gate Valve? ### Valve Body The pressure boundary holds fluid inside the valve under working pressure. The body forms the main shell and connects to the pipeline. It is cast for standard duty or forged for smaller, higher-pressure bores. Carbon steel suits general service; stainless steel resists corrosive fluids. ### Bonnet The bonnet bolts, welds, or threads onto the body to close the top opening and house the stem. Bolted bonnets suit routine maintenance, while [pressure-seal bonnets](https://www.xintaivalves.com/products/api-pressure-self-sealing-gate-valve/) use system pressure itself to tighten under extreme conditions. A gasket seals the body-bonnet joint. ### End Connections End connections link the valve to the pipe. Flanged ends bolt to matching pipe flanges. Threaded ends suit small-bore lines. Welded ends give a permanent, leak-tight joint for high-pressure or hazardous service. ## What Parts Make Up the Gate Valve Closure Mechanism? ### Gate (Wedge) The closure mechanism stops or allows flow. The gate, also called the disc or wedge, is the moving barrier. A [solid wedge](https://www.xintaivalves.com/products/casting-wedge-gate-valve/) resists high pressure but needs precise machining. A flexible wedge compensates for thermal expansion; a slab or parallel gate reduces friction during frequent cycling. ### Seat Rings Seat rings form the sealing surface the gate presses against when closed. Integral seats are machined into the body, lowering cost but complicating repairs. Renewable seats screw or weld in separately, so a worn seat can be replaced without scrapping the body. ### Seat Facing Seat facing often uses hardfacing alloys like Stellite in abrasive or high-temperature service, since bare metal wears quickly under repeated cycling. When closed, line pressure pushes the gate firmly against the downstream seat. ## How Do the Stem and Sealing Components Work Together? ### Stem: Rising vs. Non-Rising The stem transmits the handwheel’s turning motion into the gate’s up-down travel. A rising stem moves upward as the valve opens, giving a visual position check. A non-rising stem stays fixed in height, suiting buried lines or tight clearance. Our detailed comparison of [rising stem vs. non-rising stem gate valves](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/rising-stem-gate-valve-vs-non-rising-stem-gate-valve.md) covers this trade-off in more depth. Stem threads sit either outside the pressure boundary (outside screw and yoke) or inside it (inside screw). This depends on whether lubricated threads can tolerate the process fluid. ### Packing and Gland Packing seals the gap where the stem passes through the bonnet, stopping leakage while the stem still slides freely. Graphite packing handles high temperatures; PTFE suits cleaner, lower-temperature service. A gland follower compresses the packing rings evenly as they wear. ### Back Seat Many gate valves also include a back seat. This secondary seal isolates the packing area when the valve is fully open, which can reduce pressure exposure during packing service where the manufacturer’s procedure permits. ## What Components Actuate a Gate Valve? ![Gate valve actuation methods with handwheel gear and actuator](https://www.xintaivalves.com/wp-content/uploads/2026/09/image-44-1024x512.png) ### Handwheel and Yoke Manual gate valves use a handwheel sized to the torque needed for the bore diameter. Larger valves often get a geared handwheel to ease operator effort. The yoke bridges the bonnet and supports the stem nut, carrying the operating loads while the stem nut converts rotation into linear stem movement. ### Stem Nut and Gear Operator A stem nut, riding on a bearing surface, threads onto the stem so rotation drives vertical travel smoothly. On larger valves, a gear operator trades turning speed for mechanical advantage. ### Powered Actuators Pneumatic or electric actuators mount to the yoke in place of a handwheel. This suits remote or automated operation with the same stem and gate underneath. ## How Do These Valve Components Work Together in a Cross-Section View? A cross-section view lines up every gate valve part along the flow path. The body and bonnet form the outer pressure boundary. The stem runs through the bonnet, sealed by packing, and connects to the gate below. Following the flow path shows why gate valves cause so little pressure drop when open. The fully raised gate sits clear of the bore, leaving a straight channel matching the pipe’s diameter. Closed, the gate drops fully between the seat rings, blocking flow completely. This [gate valve cross-section](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-cross-section-importance.md) also shows how the yoke, stem nut, and handwheel stack above the bonnet. Together, they translate hand turns into vertical travel. The diagram below maps each part’s position. ### Simplified gate valve diagram: ![Gate valve full assembly cross-section with labeled parts](https://www.xintaivalves.com/wp-content/uploads/2026/09/image-45-1024x512.png) 1. Handwheel — Manual input; converts hand rotation into stem torque. 2. Yoke — Bridges bonnet and stem nut; carries operating loads. 3. Stem — Transfers rotation into vertical gate travel. 4. Packing / Gland — Seals the stem against external leakage. 5. Bonnet — Closes the body top; houses the stem assembly. 6. Body — Main pressure-retaining shell; connects to the pipeline. 7. Gate (Wedge) — Moving barrier that opens or blocks the bore. 8. Seat — Sealing surface the gate presses against when closed. 9. Flow Path (Bore) — Unobstructed channel when the gate is fully raised. Casting Wedge Gate Valve [ ![Casting wedge gate valve showing industrial valve components](https://xintaivalves.b-cdn.net/wp-content/uploads/2022/01/%E7%BB%84%E4%BB%B6-5-%E2%80%93-1.jpg) 🛠 Casting Wedge Gate Valve XINTAI Casting Wedge Gate Valves combine precision-machined bodies, bonnets, stems, wedges, seats, and sealing components for reliable industrial isolation. Available in multiple materials and pressure classes for oil, gas, chemical, power, and water applications. View Product ](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/taxonomy/product/casting-wedge-gate-valve.md)## Gate Valve Parts Name Reference This terminology reference helps maintenance teams match inspection findings with drawings, bills of material, and replacement specifications. ## Which Materials Suit Each Gate Valve Component? ### Body and Bonnet Materials [Material selection](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/gate-valve-material-selection-guide.md) follows the process medium, temperature, and pressure class. It also follows the standard a project calls out, such as the [API 600](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/post/what-is-api-600-gate-valve.md) vs. API 602 body construction rules. Carbon steel (ASTM A216 WCB) covers general water, oil, and steam service. Stainless steel (A351 CF8/CF8M) resists corrosive media, while bronze suits marine and freshwater systems. ### Trim Materials Trim materials — the gate, seat, and stem — often step up in hardness compared to the body. They use stainless steel or hardfaced alloys to resist erosion, and corrosion-resistant alloy steel in the stem to prevent galling. | Component | Common Material Options | Main Selection Factors | | --- | --- | --- | | Body and Bonnet | WCB, LCC, CF8, CF8M (cast) A105, F304, F316 (forged) | Pressure, temperature, corrosion | | Gate and Seats | 13Cr, 316, hardfaced alloy | Wear, erosion, shutoff duty | | Stem | Stainless or alloy steel | Strength, corrosion, galling | | Packing | Graphite, PTFE-based | Temperature, emissions, compatibility | Matching each component’s material to service conditions, rather than one alloy throughout, keeps maintenance intervals longer. It also lowers the risk of premature seal wear. ## Why Choose XINTAI for Gate Valve Components? XINTAI Valve manufactures gate valve components across [six production bases](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/page/company-profile.md) in Wenzhou, Tianjin, and Lishui. Its production covers casting, precision machining, assembly, testing, and material traceability. The range includes bronze, cast steel, and forged steel gate valves built to API, ASME, and DIN standards. XINTAI serves oil and gas, water treatment, and power generation applications. Need the right gate valve parts for your project? Explore the XINTAI gate valve collection for available models and specifications. [Get a Quote](https://www.xintaivalves.com/wp-content/uploads/wp-mfa-exports/page/contact.md)