ALIBABA VALVE Co.,Ltd.
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โพสเมื่อ
Wafer Type Segmented Ball Valve เวเฟอร์บอลวาล์ว,valve, wafer type segment ball valve, ball valve,NACHI,Pumps, Valves and Accessories/Valves/Ball Valves
รหัสสินค้า
NANA-150862
ชื่อสินค้า
Wafer Type Segmented Ball Valve เวเฟอร์บอลวาล์ว
แบรนด์
NACHI
ผลิตที่
THAILAND
ขนาด
DN25
ผลิตจาก
STAINLESS STEEL CF8
สั่งซื้อขั้นต่ำ
1PC
เวลาการจัดส่ง
3Day(s)
การขนส่ง
DELIVERLY CHECK STOCK
ราคา
395USD
รายละเอียด:


Seat Leakage Classifications

There are actually six different seat leakage classifications as defined by ANSI/FCI 70-2 2006 (European equivalent standard IEC 60534-4).

The most common used are

  • CLASS IV
  • CLASS Vl

CLASS IV is also known as metal to metal. It is the kind of leakage rate you can expect from a valve with a metal plug and metal seat.

CLASS Vl is known as a soft seat classification. Soft Seat Valves are those where either the plug or seat or both are made from some kind of composition material such as Teflon or similar.

Valve Leakage Classifications

Class I – Valve Leakage Classifications

Identical to Class II, III, and IV in construction and design intent, but no actual shop test is made. Cass I is also known as dust tight and can refer to metal or resilient seated valves.

Class II – Valve Leakage Classifications

Intended for double port or balanced singe port valves with a metal piston ring seal and metal to metal seats.

  • 0.5% leakage of full open valve capacity.
  • Service dP or 50 psid (3.4 bar differential), whichever is lower at 50 to 125 oF.
  • Test medium air at 45 to 60 psig is the test fluid.

Typical constructions:

  • Balanced, single port, single graphite piston ring, metal seat, low seat load
  • Balanced, double port, metal seats, high seat load

Class III – Valve Leakage Classifications

Intended for the same types of valves as in Class II.

  • 0.1% leakage of full open valve capacity.
  • Service dP or 50 psid (3.4 bar differential), whichever is lower at 50 to 125 oF.
  • Test medium air at 45 to 60 psig is the test fluid.

Typical constructions:

  • Balanced, double port, soft seats, low seat load
  • Balanced, single port, single graphite piston ring, lapped metal seats, medium seat load

Class IV – Valve Leakage Classifications

Intended for single port and balanced single port valves with extra tight piston seals and metal to-metal seats.

  • 0.01% leakage of full open valve capacity.
  • Service dP or 50 psid (3.4 bar differential), whichever is lower at 50 to 125 oF.
  • Test medium air at 45 to 60 psig is the test fluid.

Typical constructions:

  • Balanced, single port, Teflon piston ring, lapped metal seats, medium seat load
  • Balanced, single port, multiple graphite piston rings, lapped metal seats
  • Unbalanced, single port, lapped metal seats, medium seat load
  • Class IV is also known as metal to metal

Class V – Valve Leakage Classifications

Intended for the same types of valves as Class IV.

  • The test fluid is water at 100 psig or operating pressure.
  • Leakage allowed is limited to 5 x 10 ml per minute per inch of orifice diameter per psi differential.
  • Service dP at 50 to 125 oF.

Typical constructions:

  • Unbalanced, single port, lapped metal seats, high seat load
  • Balanced, single port, Teflon piston rings, soft seats, low seat load
  • Unbalanced, single port, soft metal seats, high seat load

Class Vl – Valve Leakage Classifications

Class Vl is known as a soft seat classification. Soft Seat Valves are those where the seat or shut-off disc or both
are made from some kind of resilient material such as Teflon. Intended for resilient seating valves.

  • The test fluid is air or nitrogen.
  • Pressure is the lesser of 50 psig or operating pressure.
  • The leakage limit depends on valve size and ranges from 0.15 to 6.75 ml per minute for valve sizes 1 through 8 inches.
คำค้นหา:
valve ball type segment wafer

บริษัท อาลีบาบา วาล์ว จำกัด

ALIBABA VALVE Co.,Ltd.

101/70 ต.บางบอน อ.บางบอน จ.กรุงเทพมหานคร 10150

024171580, 0814414161
024171386

Contact: ANANYA Alibabavalve