Trying to identify a valve before ordering a replacement? Start with the nameplate or body markings, then compare the body, operator and stem arrangement. A round handwheel or a tall bonnet can be a clue, but neither proves that the valve is a задвижка.
This guide follows five external and construction checks. You can usually gather the useful identification details from the installed valve without dismantling it.
Определение клапана затвора особенно важно, потому что он позволяет вам отличить его от других типов клапанов. Разные клапаны служат разным функциям, и использование неправильного типа может привести к неэффективности или даже повреждениям в вашей системе.
Look at the valve as a whole: its markings, соединения, operator and stem arrangement. If maintenance records or a product reference are available, compare those with what is fitted in the line.
The steps below explain which clues are useful, which are shared with other valve types, and what to send us if the identification is still unclear.
Шаг 1: Проверьте корпус клапана
Клапаны затвора обычно используются в сантехнических и промышленных приложениях для контроля потока жидкостей. Чтобы правильно управлять и поддерживать затворный клапан, важно иметь возможность идентифицировать это. Первый шаг в определении клапана затвора - проверить корпус клапана.
Gate valve bodies vary with size, material and construction. They are not reliably identified by a rectangular or square outline. Look instead for the manufacturer’s name, модель, nominal size and pressure marking cast into the body or shown on the nameplate.
The body contains a passage between the pipe connections and space for the gate to move out of that passage. From the outside, однако, much of this construction is hidden. Paint colour and body shape should be treated as supporting clues rather than a final identification.
В дополнение к его форме, Вы также можете заметить другие функции на корпусе клапана, которые могут помочь в идентификации. Они могут включать маркировку или метки, указывающие производителя или спецификации клапана. Принять к сведению эти детали могут быть полезны для будущей ссылки или при заказе заменных деталей.
Record the markings before comparing product photographs. Two valves can look similar while having different pressure ratings, materials or connections. A clear photograph of each marked area is more useful for a replacement enquiry than a description such as “the square valve”.
Помните, что определение клапана затвора включает в себя не только его внешний вид; Это также требует знания ключевых особенностей и понимания того, как они способствуют его работе. В следующих шагах, Мы рассмотрим дополнительные аспекты, которые помогут вам подтвердить, если клапан действительно является клапаном затвора.
Шаг 2: Ищите ручку
Many manual gate valves use a handwheel, but globe valves and other multi-turn valves do too. A handwheel tells you about the operating method; on its own, it does not identify the closing mechanism or show the valve position.
Check how the handwheel connects to the stem or gearbox. On an installed valve, a gearbox, chainwheel or actuator may cover details that are easy to see on a bare manual valve.
Gate valves can have handwheels, operating caps, gear operators or actuators. An underground valve operated through an extension spindle may have no visible handwheel at the body.
A freely turning handwheel is not an identification test. Resistance depends on the valve position, pressure and mechanical condition. Do not force or cycle an unidentified valve simply to find out what type it is.
Use the operator as one clue and keep its markings in your photographs. If an actuator is fitted, record the valve nameplate separately: the actuator model identifies the drive, not necessarily the valve beneath it.
Шаг 3: Examine the Stem Arrangement
Gate valves are available with rising and non-rising stems. With a rising-stem arrangement, the stem travels upwards as the gate opens. With an NRS arrangement, the stem rotates without rising while the gate moves inside the body.
Check the visible stem arrangement and any position indicator. A stem that stays at the same external height does not rule out a gate valve. Наш Операционные системы&Y and NRS gate valve comparison shows why both arrangements are used.
A rising stem gives an indication of gate travel; an NRS valve may have a separate position indicator. These indications describe the operating position, rather than proving that a closed valve is leak-tight.
Stem length alone cannot tell you whether a valve needs replacement. For identification, the model, operator arrangement and visible markings are more useful. Keep condition assessment separate from identifying the valve type.
Also remember that other valve types can have rising stems. Confirm the stem clue against the body markings and the product information before deciding what to order.
Шаг 4: Confirm the Gate Construction
The gate is the closing element that distinguishes a gate valve. In most installed gate valves it is enclosed by the body and bonnet, so it is not available for direct visual inspection. Use the identified model or existing product information to confirm the construction.
А wedge gate moves across the flow path and retracts from it when opened. In a parallel gate design, “parallel” describes the seating arrangement, not a gate lying along the flow. Ordinary gate valves are intended for isolation, normally fully open or fully closed, rather than precise flow regulation.
Материал, используемый для построения ворот, также важен для рассмотрения. Клапаны могут иметь ворота из различных материалов, таких как латунь, нержавеющая сталь, или чугун, в зависимости от их предполагаемого применения и условий работы. Крайне важно убедиться, что материал затвора совместимы с транспортными жидкостями через клапан, чтобы предотвратить коррозию или повреждение.
Кроме того, Обратите внимание на любой видимый износ или повреждение на поверхности ворот. Через некоторое время, Ворота могут испытывать эрозию или ямы из-за длительного воздействия абразивных жидкостей или высокоскоростных потоков. Эти признаки износа могут повлиять на производительность и возможности герметизации клапана.
If the valve is already dismantled during planned maintenance, photographs of the gate and seat can help identify the design. For an installed valve, do not remove the bonnet just to inspect the gate; identification should begin with the external information.
Шаг 5: Определите капот
The bonnet is the cover joined to the valve body above the gate. It forms part of the pressure boundary and houses or supports the stem sealing arrangement.
Bonnet materials vary with the valve design and service, including iron, steel and other alloys. Neither a particular material nor a dome-shaped outline is exclusive to gate valves.
The bonnet may be bolted, threaded or attached by another design-specific joint. The joint seals the bonnet to the body, while packing or another stem-seal arrangement seals around the moving stem. These are distinct sealing locations.
Photograph the body-to-bonnet joint and any visible model markings. A globe valve can also have a bonnet above the body, so this feature needs to be read together with the other clues.
Идентифицируя и понимая цель капота, Вы можете обеспечить правильное обслуживание и эксплуатацию клапанов затвора в сантехнике и промышленных условиях. Регулярный осмотр и поддержание этого важнейшего компонента помогут продлить срок службы и предотвратить любые потенциальные проблемы, которые могут возникнуть из -за утечки или повреждения.
Confirm the Identification Before Ordering
A reliable identification brings several clues together. Keep the nameplate and body markings as the starting point, then compare the connections, operator, stem and bonnet with the corresponding product information.
The external body shape helps describe what is installed, but it does not establish the valve type. Record the nominal size and pressure markings as well as the manufacturer and model where these are legible.
A handwheel is common to several valve types. Include the gearbox or actuator reference where fitted, while keeping the valve’s own identification separate.
A gate valve may have a rising or non-rising stem. Note the arrangement and any position indicator, especially where headroom or remote operation will affect the replacement.
The internal gate determines the closing design. Confirm it from the model or maintenance records when possible, rather than opening an installed valve to look inside.
The bonnet and connection details help narrow the match. For a replacement, compare the end connections and installed length as well as the nominal pipe size.
Still unsure what is fitted? Send Farpro a valve identification enquiry with an overall photo and close-ups of the nameplate, body markings and connections. Tell us the fluid, required quantity and destination. We can discuss the likely product options and the details still needed before quoting a replacement.
Once the arrangement is clear, explore Farpro’s Операционные системы&Y-образные задвижки, Задвижки НРС или flanged gate valve range. The product pages show existing models to compare with your requirement.