Ever wondered what abbreviations like DN, PN, ½, WOG, and CWP letters on a valve mean? Curious about the markings on a valve body and what other letters might appear? Let’s dive in and explore.

The markings on a valve typically represent crucial information such as its size, pressure and temperature ratings, material composition, brand, flow direction, and certifications. These details are vital in proper selection, instalación, and operation, ensuring the valve is used safely and correctly.

1. Valve Size Marking:“DN” y “½” Fraction or Letters on Valve

The valve size is its most fundamental parameter, indicando ar orificio nominal ar tubería encaja. nu'bu̲ da nthe̲hu̲ 'ra bí marca jar 'na yoho ya maneras:

• DN (Diámetro nominal): Ar diámetro nominal, 'nar xe̲ni métrica (jar milímetros) utilizado ja ar ximhai (ISO) ne jar europeo yá chino (EN yá GB) estándares. Ngu, DN50 ir bo̲ni ar barbula ar pa 'nar tubería ko 'nar 50 diámetro nominal ar mm.
• Hontho generación datos (NPS (tamaño nominal ar tubería): 'nar ar xe̲ni imperial (jar pulgadas) usado ja ya estándares americanos (ASME yá ANSI). Ngu, 4″ wa NPS 4 indica ar barbula ar pa 'nar tubería 4 pulgadas. ya bes, ho̲ntho ar 'bede, ngu 4, ar fundido komongu ar barbula.

2. Valve Pressure Rating Marking: “PN” and Numbers on Valve

clasificación presión gi 'ñudi máxima presión 'be̲fi 'nar barbula tsa̲ da 'ye̲ ko ntsuni ja 'nar mpat'i dada ne ar mahyoni pa ar selección.

• Estándares ISO yá EN yá GB: Njapu'befi “Nominal Pressure” (PN), ho ar xe̲ni ar barra xí. Ár hmädi PN indica clasificación presión mpat'i ambiente. Ejemplos: PN16, PN40.
• ASME/ANSI Estándares: Usa 'na “Nsa̲di” ko, ko ya 'yot'i komongu NSA̲DI, CL, LB, or #. Examples include CLASS 150, 300#, or 150 LB. This represents a pressure-temperature curve, not a constant pressure value.
• General Purpose Ratings:
  • WOG (Ar dehe, Oil, Gas): Indicates the pressure rating in psi for water, asete, and gas service at ambient temperatures. Example: 600 WOG.
  • CWP (Cold Working Pressure): The modern equivalent of WOG, also indicating the maximum allowable pressure at ambient temperature. Example: 1000 CWP.

3. Valve Material Marking:

The material code is one of the most important markings, specifying the material of the main pressure-containing parts like the body and bonnet.

• Cast Carbon Steel: WCB is the most common grade.
• Cast Stainless Steel: CF8(equivalent to 304 SS), CF8M(316 SS), CF3(304L), CF3M(316L).
• Cast Alloy Steel: WC6, WC9(chrome-moly steel for high-temperature service).
• Forged Materials: A105(carbon steel), A182 F316(stainless steel).
• 'Ñotho ar plomo: “LF” means lead-free material, including brass and bronze.

4. Valve Media Marking:

The specific service medium (nt'udi, “Sulfuric Acid”) is generally not marked. Suitability for a medium is determined by the valve’sHñei. 'Ñotho ar embargo, for certain special services, specific markings are used:

• WOG: suitable for normal Water Oil Gas medium
• S: Steam medium
• G: Gas medium

5. Valve Brand Marking:

This refers to the manufacturer’s trademark, logo, or name abbreviation, used to identify the producer. Ngu, “BMAG” or a unique symbol.

6. Valve Flow Direction Marking:

For unidirectional valves like globe valves, check valves, and angle valves, a clear arrow symbol(→) must be cast or stamped on the body. This arrow indicates the correct direction of media flow. Incorrect installation can lead to malfunction or damage.

7. Valve Certifications Marking:

These markings indicate that the valve complies with specific regional or industry regulations and standards.

• CE: Abbreviation for “Conformité Européenne,” indicating compliance with EU safety, health, estándares 'ba̲ts'i ar nt'uni mbo jar ximha̲i, mahyoni pa 'ba̲ ya productos jar Europa.
• API: Ar logotipo Instituto ar Petróleo Americano ar gi hyandi tso̲kwa menudo jar válvulas sector petróleo ne gas.
• CSA: Asociación estándares canadiense, 'nar certificación mahyoni pa comercializar equipos jar Canadá.
• UL: Underwriters Laboratories, nuna ar certificación indica nthädi hä ntsuni laboratorios ar suscriptores, 'nar Hmunts'i ciencia ntsuni ja ya ximhai. indica da 'nar producto, Parte, wa ko ya xi sometido a pruebas ne tso̲ni ko criterios ntsuni definidos.

Descubre válvulas mextha hño jar BMAG.